9x-21=87

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Solution for 9x-21=87 equation: 


Simplifying
9x + -21 = 87

Reorder the terms:
-21 + 9x = 87

Solving
-21 + 9x = 87

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 9x = 87 + 21

Combine like terms: -21 + 21 = 0
0 + 9x = 87 + 21
9x = 87 + 21

Combine like terms: 87 + 21 = 108
9x = 108

Divide each side by '9'.
x = 12

Simplifying
x = 12

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