3x+x-12=8

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


Simplifying
3x + x + -12 = 8

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

Combine like terms: 3x + x = 4x
-12 + 4x = 8

Solving
-12 + 4x = 8

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 4x = 8 + 12

Combine like terms: -12 + 12 = 0
0 + 4x = 8 + 12
4x = 8 + 12

Combine like terms: 8 + 12 = 20
4x = 20

Divide each side by '4'.
x = 5

Simplifying
x = 5

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