Question

Rozwiąż równania

a) 4(x+1)-x=-5

b) x-7(3x+5)=2(2x+1)

c) 4x-5-(x +3)=7

d) -3(x+1)-x=9

Answer 1

a) 4x + 4 - x = -5
  3 x + 4 = -5
 3 x = -5 -4
3 x  = -9
x = -3

b) x - 21x - 35 = 4x + 2
 x - 21x - 4x = 35 + 2
-24x = 37
x = -1.54

c) 4x + 5 - 15 = 7
 4 x - 10 = 7
4 x = 7 + 10
4x = 17
x = 4.25


d) -3x - 3 - x = 9
 - 4x - 3 = 9
- 4 x = 9 + 3
- 4 x = 12
x = - 3

Answer 2

a)

4(x+1)-x=-5

4x+4-x=-5

3x=-9     /:3

x = -3

 

b)

x-7(3x+5)=2(2x+1)

x-21x-35=4x+2

-20x-4x=2+35

-24x = 37    /:(-24

x = - 37/24

x = - 1 13/24

 

c)

4x-5-(x +3)=7

4x-5-x-3=7

3x = 7+5

3x = 12     /:3

x = 4

 

d)

-3(x+1)-x=9

-3x-3-x=9

-4x=9+3

-4x=12        /(-4

x = -3