10y+21=12y-15

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Solution for 10y+21=12y-15 equation: 



10y+21=12y-15

We move all terms to the left:

10y+21-(12y-15)=0

We get rid of parentheses

10y-12y+15+21=0

We add all the numbers together, and all the variables

-2y+36=0

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

-2y=-36

y=-36/-2

y=+18

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