y+42=y-21+y

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Solution for y+42=y-21+y equation: 



y+42=y-21+y

We move all terms to the left:

y+42-(y-21+y)=0

We add all the numbers together, and all the variables

y-(2y-21)+42=0

We get rid of parentheses

y-2y+21+42=0

We add all the numbers together, and all the variables

-1y+63=0

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

-y=-63

y=-63/-1

y=+63

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