12y-100=9y+20

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Solution for 12y-100=9y+20 equation: 



12y-100=9y+20

We move all terms to the left:

12y-100-(9y+20)=0

We get rid of parentheses

12y-9y-20-100=0

We add all the numbers together, and all the variables

3y-120=0

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

3y=120

y=120/3

y=40

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