21x-9=180

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Solution for 21x-9=180 equation: 


Simplifying
21x + -9 = 180

Reorder the terms:
-9 + 21x = 180

Solving
-9 + 21x = 180

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 21x = 180 + 9

Combine like terms: -9 + 9 = 0
0 + 21x = 180 + 9
21x = 180 + 9

Combine like terms: 180 + 9 = 189
21x = 189

Divide each side by '21'.
x = 9

Simplifying
x = 9

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