-81-9=8x+21

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Solution for -81-9=8x+21 equation:


Simplifying
-81 + -9 = 8x + 21

Combine like terms: -81 + -9 = -90
-90 = 8x + 21

Reorder the terms:
-90 = 21 + 8x

Solving
-90 = 21 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
-90 + -8x = 21 + 8x + -8x

Combine like terms: 8x + -8x = 0
-90 + -8x = 21 + 0
-90 + -8x = 21

Add '90' to each side of the equation.
-90 + 90 + -8x = 21 + 90

Combine like terms: -90 + 90 = 0
0 + -8x = 21 + 90
-8x = 21 + 90

Combine like terms: 21 + 90 = 111
-8x = 111

Divide each side by '-8'.
x = -13.875

Simplifying
x = -13.875

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