-3x+21=3x-21

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


Simplifying
-3x + 21 = 3x + -21

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

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

Solving
21 + -3x = -21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
21 + -3x + -3x = -21 + 3x + -3x

Combine like terms: -3x + -3x = -6x
21 + -6x = -21 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -6x = -21 + 0
21 + -6x = -21

Add '-21' to each side of the equation.
21 + -21 + -6x = -21 + -21

Combine like terms: 21 + -21 = 0
0 + -6x = -21 + -21
-6x = -21 + -21

Combine like terms: -21 + -21 = -42
-6x = -42

Divide each side by '-6'.
x = 7

Simplifying
x = 7

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