21=7-7x

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Solution for 21=7-7x equation:


Simplifying
21 = 7 + -7x

Solving
21 = 7 + -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 = 7 + -7x + 7x

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

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

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

Combine like terms: 7 + -21 = -14
7x = -14

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

Simplifying
x = -2

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