90=3(12+y)

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Solution for 90=3(12+y) equation: 



90=3(12+y)

We move all terms to the left:

90-(3(12+y))=0

We add all the numbers together, and all the variables

-(3(y+12))+90=0



We calculate terms in parentheses: -(3(y+12)), so:

3(y+12)

We multiply parentheses

3y+36

Back to the equation:

-(3y+36)



We get rid of parentheses

-3y-36+90=0

We add all the numbers together, and all the variables

-3y+54=0

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

-3y=-54

y=-54/-3

y=+18

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