-30-9=8x+21

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Solution for -30-9=8x+21 equation: 


Simplifying
-30 + -9 = 8x + 21

Combine like terms: -30 + -9 = -39
-39 = 8x + 21

Reorder the terms:
-39 = 21 + 8x

Solving
-39 = 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.
-39 + -8x = 21 + 8x + -8x

Combine like terms: 8x + -8x = 0
-39 + -8x = 21 + 0
-39 + -8x = 21

Add '39' to each side of the equation.
-39 + 39 + -8x = 21 + 39

Combine like terms: -39 + 39 = 0
0 + -8x = 21 + 39
-8x = 21 + 39

Combine like terms: 21 + 39 = 60
-8x = 60

Divide each side by '-8'.
x = -7.5

Simplifying
x = -7.5

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