4y+9y=91

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Solution for 4y+9y=91 equation: 


Simplifying
4y + 9y = 91

Combine like terms: 4y + 9y = 13y
13y = 91

Solving
13y = 91

Solving for variable 'y'.

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

Divide each side by '13'.
y = 7

Simplifying
y = 7

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