13y-4y=81

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Solution for 13y-4y=81 equation: 


Simplifying
13y + -4y = 81

Combine like terms: 13y + -4y = 9y
9y = 81

Solving
9y = 81

Solving for variable 'y'.

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

Divide each side by '9'.
y = 9

Simplifying
y = 9

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