-21=4x-x

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Solution for -21=4x-x equation:


Simplifying
-21 = 4x + -1x

Combine like terms: 4x + -1x = 3x
-21 = 3x

Solving
-21 = 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.
-21 + -3x = 3x + -3x

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

Add '21' to each side of the equation.
-21 + 21 + -3x = 0 + 21

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

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

Divide each side by '-3'.
x = -7

Simplifying
x = -7

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