Question

A) -5x+12+x=2x-12 b) -5x+10=-2x-8 c) 2*(x+2)-3(x-1)+8=3x-1 d) 3(x-4)-2(2x-5)=-4 *= znam mnożenia proszę o pomoc ;)

Answer 1

a) -5x+12+x = 2x-12

-5x+x-2x = -12-12

-6x = -24 /:(-6)

x = 4

 

b) -5x+10 = -2x-8

-5x-2x = -8-10

-7x = -18 /: (-7)

x = 2 i 4/7

 

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

2x+4-3x+3+8 = 3x-1

2x-3x-3x = -1-4-3-8

-4x = -16 /:(-4)

x = 4

 

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

3x-12-4x+10=-4

3x-4x=-4+12-10

-x = -2 /:(-1)

x = 2

 

Hope it helps.

Answer 2

a) -5x+12+x=2x-12

-2x=0 |:(-2)

x=0

 

b) -5x+10=-2x-8 

-3x=-18 |:(-3)

x=6

 

c) 2*(x+2)-3(x-1)+8=3x-1

2x+4-3x+3+8=3x-1

-4x=-16 |:(-4)

x=4

 

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

3x-12-4x+10=-4

-x=-2 |:(-1)

x=2