-3x-21=x+15

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Solution for -3x-21=x+15 equation:


Simplifying
-3x + -21 = x + 15

Reorder the terms:
-21 + -3x = x + 15

Reorder the terms:
-21 + -3x = 15 + x

Solving
-21 + -3x = 15 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-21 + -3x + -1x = 15 + x + -1x

Combine like terms: -3x + -1x = -4x
-21 + -4x = 15 + x + -1x

Combine like terms: x + -1x = 0
-21 + -4x = 15 + 0
-21 + -4x = 15

Add '21' to each side of the equation.
-21 + 21 + -4x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + -4x = 15 + 21
-4x = 15 + 21

Combine like terms: 15 + 21 = 36
-4x = 36

Divide each side by '-4'.
x = -9

Simplifying
x = -9

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