12.y+y=91

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Solution for 12.y+y=91 equation: 



12.y+y=91

We move all terms to the left:

12.y+y-(91)=0

We add all the numbers together, and all the variables

13y-91=0

We move all terms containing y to the left, all other terms to the right

13y=91

y=91/13

y=7

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