21=y+-5

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Solution for 21=y+-5 equation: 



21=y+-5

We move all terms to the left:

21-(y+-5)=0

We add all the numbers together, and all the variables

-(y-5)+21=0

We get rid of parentheses

-y+5+21=0

We add all the numbers together, and all the variables

-1y+26=0

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

-y=-26

y=-26/-1

y=+26

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