0=-5(3y+21)

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Solution for 0=-5(3y+21) equation: 



0=-5(3y+21)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-5(3y+21)), so:

-5(3y+21)

We multiply parentheses

-15y-105

Back to the equation:

-(-15y-105)



We get rid of parentheses

15y+105=0

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

15y=-105

y=-105/15

y=-7

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