12+9y=13y

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Solution for 12+9y=13y equation: 



12+9y=13y

We move all terms to the left:

12+9y-(13y)=0

We add all the numbers together, and all the variables

-4y+12=0

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

-4y=-12

y=-12/-4

y=+3

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