7xy+9xy=21

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Solution for 7xy+9xy=21 equation: 


Simplifying
7xy + 9xy = 21

Combine like terms: 7xy + 9xy = 16xy
16xy = 21

Solving
16xy = 21

Solving for variable 'x'.

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

Divide each side by '16y'.
x = 1.3125y-1

Simplifying
x = 1.3125y-1

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