3x=12+x

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Solution for 3x=12+x equation: 


Simplifying
3x = 12 + x

Solving
3x = 12 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
3x + -1x = 12 + x + -1x

Combine like terms: 3x + -1x = 2x
2x = 12 + x + -1x

Combine like terms: x + -1x = 0
2x = 12 + 0
2x = 12

Divide each side by '2'.
x = 6

Simplifying
x = 6

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