x*y=9

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Solution for x*y=9 equation: 


Simplifying
x * y = 9

Multiply x * y
xy = 9

Solving
xy = 9

Solving for variable 'x'.

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

Divide each side by 'y'.
x = 9y-1

Simplifying
x = 9y-1

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