3(y-1)=-21

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



3(y-1)=-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(y-1)+21=0

We multiply parentheses

3y-3+21=0

We add all the numbers together, and all the variables

3y+18=0

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

3y=-18

y=-18/3

y=-6

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