Question

2x+4x-6=7x-4
-6x+7x=4x+2
3x+4=5.(-2+x)-7

Answer 1

2x+4x-6=7x-4
2x+4x-7x=-4+6
6x-7x=2
-x=2.(-1)
x=2
-6x+7x=4x+2
-6x-4x=2-7
-10x=-5.(-1)
10x=5
x=5/10 (:5)
x=1/2
3x+4=5.(-2+x)-7
3x+4=-10+5x-7
3x-5x=-10-7-4
-2x=-21.(-1)
2x=21
x=21/2

Answer 2

2x + 4x - 6 = 7x - 4
6x - 7x = - 4 + 6
- x =  2 (- 1)
x = - 2
S = {- 2}

-6x + 7x = 4x + 2
x - 4x = 2
- 3x = 2 (- 1)
3x = - 2
x = - 2/3
S = {- 2/3}

3x + 4 = 5.(-2 + x) - 7
3x + 4 = - 10 + 5x - 7
3x - 5x = - 17 - 4
- 2x = - 21 (- 1)
2x = 21
x = 21/2
ou x = 10 1/2
S = {21/2}  ou  S = {10 1/2}