3x+21=-3x-39

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Solution for 3x+21=-3x-39 equation:


Simplifying
3x + 21 = -3x + -39

Reorder the terms:
21 + 3x = -3x + -39

Reorder the terms:
21 + 3x = -39 + -3x

Solving
21 + 3x = -39 + -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 = -39 + -3x + 3x

Combine like terms: 3x + 3x = 6x
21 + 6x = -39 + -3x + 3x

Combine like terms: -3x + 3x = 0
21 + 6x = -39 + 0
21 + 6x = -39

Add '-21' to each side of the equation.
21 + -21 + 6x = -39 + -21

Combine like terms: 21 + -21 = 0
0 + 6x = -39 + -21
6x = -39 + -21

Combine like terms: -39 + -21 = -60
6x = -60

Divide each side by '6'.
x = -10

Simplifying
x = -10

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