21=36+2y

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Solution for 21=36+2y equation: 



21=36+2y

We move all terms to the left:

21-(36+2y)=0

We add all the numbers together, and all the variables

-(2y+36)+21=0

We get rid of parentheses

-2y-36+21=0

We add all the numbers together, and all the variables

-2y-15=0

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

-2y=15

y=15/-2

y=-7+1/2

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