3x=84-x

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Solution for 3x=84-x equation: 


Simplifying
3x = 84 + -1x

Solving
3x = 84 + -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.
3x + x = 84 + -1x + x

Combine like terms: 3x + x = 4x
4x = 84 + -1x + x

Combine like terms: -1x + x = 0
4x = 84 + 0
4x = 84

Divide each side by '4'.
x = 21

Simplifying
x = 21

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