8y-(7y-42)=21

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Solution for 8y-(7y-42)=21 equation: 



8y-(7y-42)=21

We move all terms to the left:

8y-(7y-42)-(21)=0

We get rid of parentheses

8y-7y+42-21=0

We add all the numbers together, and all the variables

y+21=0

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

y=-21

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