42=51-y

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Solution for 42=51-y equation: 



42=51-y

We move all terms to the left:

42-(51-y)=0

We add all the numbers together, and all the variables

-(-1y+51)+42=0

We get rid of parentheses

1y-51+42=0

We add all the numbers together, and all the variables

y-9=0

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

y=9

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