-3(y-7)=4y-21

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Solution for -3(y-7)=4y-21 equation: 



-3(y-7)=4y-21

We move all terms to the left:

-3(y-7)-(4y-21)=0

We multiply parentheses

-3y-(4y-21)+21=0

We get rid of parentheses

-3y-4y+21+21=0

We add all the numbers together, and all the variables

-7y+42=0

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

-7y=-42

y=-42/-7

y=+6

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