3x+x-8=12

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


Simplifying
3x + x + -8 = 12

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

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

Solving
-8 + 4x = 12

Solving for variable 'x'.

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

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

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

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

Divide each side by '4'.
x = 5

Simplifying
x = 5

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