(84-x)=3x

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Solution for (84-x)=3x equation:


Simplifying
(84 + -1x) = 3x

Remove parenthesis around (84 + -1x)
84 + -1x = 3x

Solving
84 + -1x = 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
84 + -1x + -3x = 3x + -3x

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

Combine like terms: 3x + -3x = 0
84 + -4x = 0

Add '-84' to each side of the equation.
84 + -84 + -4x = 0 + -84

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

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

Divide each side by '-4'.
x = 21

Simplifying
x = 21

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