12y-21=2y-1

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Solution for 12y-21=2y-1 equation: 



12y-21=2y-1

We move all terms to the left:

12y-21-(2y-1)=0

We get rid of parentheses

12y-2y+1-21=0

We add all the numbers together, and all the variables

10y-20=0

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

10y=20

y=20/10

y=2

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