Question

zad 1

a) 2(x-7)-3(x+2)=4(x+3)+2(x-9)

b) -3(x+6)-6(2x+8)=-2(4-x)+9(x+8)

c) -8(x+2)+3(x+5)=-2(2x+3)+4(2x-1)

d) 6(4-x)+5(2x-5)=4(x-1)-3(4-x)

zad 2

a) 3(3-x)+2x=8-2(x-1)

b) 4x+5-(3x+6)=2(2+x)-4

c) 4-5(3-x)=-x-(3-2x)

d) x-(7+2x)=2(x-1)+1

daje naj :D

Answer 1

a) 2(x-7)-3(x+2)=4(x+3)+2(x-9)
2x - 14 - 3x - 6 = 4x + 12 + 2x - 18
2x - 3x - 4x - 2x = 12 - 18 + 14 + 6
-7x = 14 
x = -2

b) -3(x+6)-6(2x+8)=-2(4-x)+9(x+8)

-3x-18-12x-48=-8+2x+9x+72

-3x-12x-2x-9x=72-8+48+18

-26x=130

x=-5
c) -8(x+2)+3(x+5)=-2(2x+3)+4(2x-1)

-8x-16+3x+15=-4x-6+8x-4

-8x+3x-8x+4x=-4-6-15+16

-9x=-9

x=1

d) 6(4-x)+5(2x-5)=4(x-1)-3(4-x)
24 - 6x + 10x - 25 = 4x - 4 - 12 + 3x
-6x + 10x - 4x - 3x = -4 - 12 - 24 + 25
-3x = -15
x = 5

 

zad 2
a) 3(3-x)+2x=8-2(x-1)

9-3x+2x=8-2x+2

-3x+2x+2x=8-9+2

x=1
b) 4x+5-(3x+6)=2(2+x)-4

4x+5-3x-6=4+2x-4

4x-3x-2x=4-4-5+6

-x=1

x=-1
c) 4-5(3-x)=-x-(3-2x)

4-15+5x=-x-3+2x

5x-2x+x=15-4-3

4x=8

x=2
d) x-(7+2x)=2(x-1)+1

x-7-2x=2x-2+1

x-2x-2x=7+1-2

-3x=6

x=-2

Answer 2

1.
a) 2(x-7)-3(x+2)=4(x+3)+2(x-9)
2x - 14 - 3x - 6 = 4x + 12 + 2x - 18
2x - 3x - 4x - 2x = 12 - 18 + 14 + 6
-7x = 14     /:(-7)
x = -2

b) -3(x+6)-6(2x+8)=-2(4-x)+9(x+8)
-3x - 18 - 12x - 48 = -8 + 2x + 9x + 72
-3x - 12x - 2x - 9x = -8 + 72 + 18 + 48
-26x = 130     /:(-26)
x = -5

c) -8(x+2)+3(x+5)=-2(2x+3)+4(2x-1)
-8x - 16 + 3x + 15 = -4x - 6 + 8x - 4
-8x + 3x + 4x - 8x = -6 - 4 + 16 - 15
-9x = -9     /:(-9)
x = 1

d) 6(4-x)+5(2x-5)=4(x-1)-3(4-x)
24 - 6x + 10x - 25 = 4x - 4 - 12 + 3x
-6x + 10x - 4x - 3x = -4 - 12 - 24 + 25
-3x = -15    /:(-3)
x = 5

2.
a) 3(3-x)+2x=8-2(x-1)
9 - 3x + 2x = 8 - 2x + 2
-3x + 2x + 2x = 8 + 2 - 9
x = 1

b) 4x+5-(3x+6)=2(2+x)-4
4x + 5 - 3x - 6 = 4 + 2x - 4
4x - 3x - 2x = 4 - 4 - 5 + 6
-x = 1    /:(-1)
x = -1

c) 4-5(3-x)=-x-(3-2x)
4 - 15 + 5x = -x - 3 + 2x
5x + x - 2x = -3 - 4 + 15
4x = 8     /:4
x = 2

d) x-(7+2x)=2(x-1)+1
x - 7 - 2x = 2x - 2 + 1
x - 2x - 2x = -2 + 1 + 7
-3x = 6    /:(-3)

x = -2