x=r(9r)

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Solution for x=r(9r) equation: 


Simplifying
x = r(9r)

Remove parenthesis around (9r)
x = r * 9r

Reorder the terms for easier multiplication:
x = 9r * r

Multiply r * r
x = 9r2

Solving
x = 9r2

Solving for variable 'x'.

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

Simplifying
x = 9r2

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