-21=21-7x

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Solution for -21=21-7x equation:


Simplifying
-21 = 21 + -7x

Solving
-21 = 21 + -7x

Solving for variable 'x'.

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

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

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

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

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

Combine like terms: 21 + 21 = 42
7x = 42

Divide each side by '7'.
x = 6

Simplifying
x = 6

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