21=25+y

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Solution for 21=25+y equation: 



21=25+y

We move all terms to the left:

21-(25+y)=0

We add all the numbers together, and all the variables

-(y+25)+21=0

We get rid of parentheses

-y-25+21=0

We add all the numbers together, and all the variables

-1y-4=0

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

-y=4

y=4/-1

y=-4

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