(X-15)15=90

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Solution for (X-15)15=90 equation: 


Simplifying
(X + -15) * 15 = 90

Reorder the terms:
(-15 + X) * 15 = 90

Reorder the terms for easier multiplication:
15(-15 + X) = 90
(-15 * 15 + X * 15) = 90
(-225 + 15X) = 90

Solving
-225 + 15X = 90

Solving for variable 'X'.

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

Add '225' to each side of the equation.
-225 + 225 + 15X = 90 + 225

Combine like terms: -225 + 225 = 0
0 + 15X = 90 + 225
15X = 90 + 225

Combine like terms: 90 + 225 = 315
15X = 315

Divide each side by '15'.
X = 21

Simplifying
X = 21

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