3x-7-8x=12

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Solution for 3x-7-8x=12 equation:


Simplifying
3x + -7 + -8x = 12

Reorder the terms:
-7 + 3x + -8x = 12

Combine like terms: 3x + -8x = -5x
-7 + -5x = 12

Solving
-7 + -5x = 12

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '7' to each side of the equation.
-7 + 7 + -5x = 12 + 7

Combine like terms: -7 + 7 = 0
0 + -5x = 12 + 7
-5x = 12 + 7

Combine like terms: 12 + 7 = 19
-5x = 19

Divide each side by '-5'.
x = -3.8

Simplifying
x = -3.8

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