-21=-7-5x+7x

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Solution for -21=-7-5x+7x equation:


Simplifying
-21 = -7 + -5x + 7x

Combine like terms: -5x + 7x = 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 = 14
-2x = 14

Divide each side by '-2'.
x = -7

Simplifying
x = -7

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