9xy-13=40

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Solution for 9xy-13=40 equation: 


Simplifying
9xy + -13 = 40

Reorder the terms:
-13 + 9xy = 40

Solving
-13 + 9xy = 40

Solving for variable 'x'.

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

Add '13' to each side of the equation.
-13 + 13 + 9xy = 40 + 13

Combine like terms: -13 + 13 = 0
0 + 9xy = 40 + 13
9xy = 40 + 13

Combine like terms: 40 + 13 = 53
9xy = 53

Divide each side by '9y'.
x = 5.888888889y-1

Simplifying
x = 5.888888889y-1

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