3(y-1)=4y-21

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Solution for 3(y-1)=4y-21 equation: 



3(y-1)=4y-21

We move all terms to the left:

3(y-1)-(4y-21)=0

We multiply parentheses

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

We get rid of parentheses

3y-4y+21-3=0

We add all the numbers together, and all the variables

-1y+18=0

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

-y=-18

y=-18/-1

y=+18

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