10y+12=y+21

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



10y+12=y+21

We move all terms to the left:

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

We get rid of parentheses

10y-y-21+12=0

We add all the numbers together, and all the variables

9y-9=0

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

9y=9

y=9/9

y=1

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