3x-x=21-x

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Solution for 3x-x=21-x equation: 


Simplifying
3x + -1x = 21 + -1x

Combine like terms: 3x + -1x = 2x
2x = 21 + -1x

Solving
2x = 21 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
2x + x = 21 + -1x + x

Combine like terms: 2x + x = 3x
3x = 21 + -1x + x

Combine like terms: -1x + x = 0
3x = 21 + 0
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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