x+3x=12+x

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


Simplifying
x + 3x = 12 + x

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

Solving
4x = 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.
4x + -1x = 12 + x + -1x

Combine like terms: 4x + -1x = 3x
3x = 12 + x + -1x

Combine like terms: x + -1x = 0
3x = 12 + 0
3x = 12

Divide each side by '3'.
x = 4

Simplifying
x = 4

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