Question

Hacer la cuenta y verificar 7x-12-12x=-x+12

Answer 1

7x -12 -12x = -x +12

-12 -12 = -x -7x +12x

-24 = 4x

-24/4 = x

-6 = x

x = -6

Comprobamos:
7x -12 -12x = -x +12

7(-6) -12 -12 (-6) = - (-6) +12

-42 -12 +72 = +6 +12

-54 +72 = 18

18 = 18

Answer 2

7x - 12 -12x=-x + 12
7x - 12x + x =12 + 12
-4x = 24
x = - 6