-3y+21=3(y+5)

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Solution for -3y+21=3(y+5) equation: 



-3y+21=3(y+5)

We move all terms to the left:

-3y+21-(3(y+5))=0



We calculate terms in parentheses: -(3(y+5)), so:

3(y+5)

We multiply parentheses

3y+15

Back to the equation:

-(3y+15)



We get rid of parentheses

-3y-3y-15+21=0

We add all the numbers together, and all the variables

-6y+6=0

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

-6y=-6

y=-6/-6

y=1

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