-21=x+7-3x

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Solution for -21=x+7-3x equation:


Simplifying
-21 = x + 7 + -3x

Reorder the terms:
-21 = 7 + x + -3x

Combine like terms: x + -3x = -2x
-21 = 7 + -2x

Solving
-21 = 7 + -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
-21 + 2x = 7 + -2x + 2x

Combine like terms: -2x + 2x = 0
-21 + 2x = 7 + 0
-21 + 2x = 7

Add '21' to each side of the equation.
-21 + 21 + 2x = 7 + 21

Combine like terms: -21 + 21 = 0
0 + 2x = 7 + 21
2x = 7 + 21

Combine like terms: 7 + 21 = 28
2x = 28

Divide each side by '2'.
x = 14

Simplifying
x = 14

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