-x-21=3x+15

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


Simplifying
-1x + -21 = 3x + 15

Reorder the terms:
-21 + -1x = 3x + 15

Reorder the terms:
-21 + -1x = 15 + 3x

Solving
-21 + -1x = 15 + 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 + -1x + -3x = 15 + 3x + -3x

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

Combine like terms: 3x + -3x = 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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