-7x+21=7x-21

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


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

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

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

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

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

Combine like terms: 7x + -7x = 0
21 + -14x = -21 + 0
21 + -14x = -21

Add '-21' to each side of the equation.
21 + -21 + -14x = -21 + -21

Combine like terms: 21 + -21 = 0
0 + -14x = -21 + -21
-14x = -21 + -21

Combine like terms: -21 + -21 = -42
-14x = -42

Divide each side by '-14'.
x = 3

Simplifying
x = 3

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