-8x-15=21

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Solution for -8x-15=21 equation: 


Simplifying
-8x + -15 = 21

Reorder the terms:
-15 + -8x = 21

Solving
-15 + -8x = 21

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + -8x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + -8x = 21 + 15
-8x = 21 + 15

Combine like terms: 21 + 15 = 36
-8x = 36

Divide each side by '-8'.
x = -4.5

Simplifying
x = -4.5

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