3(-21-7y)=-42

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Solution for 3(-21-7y)=-42 equation: 



3(-21-7y)=-42

We move all terms to the left:

3(-21-7y)-(-42)=0

We add all the numbers together, and all the variables

3(-7y-21)-(-42)=0

We add all the numbers together, and all the variables

3(-7y-21)+42=0

We multiply parentheses

-21y-63+42=0

We add all the numbers together, and all the variables

-21y-21=0

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

-21y=21

y=21/-21

y=-1

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