-90=3(x-15)

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Solution for -90=3(x-15) equation: 



-90=3(x-15)

We move all terms to the left:

-90-(3(x-15))=0



We calculate terms in parentheses: -(3(x-15)), so:

3(x-15)

We multiply parentheses

3x-45

Back to the equation:

-(3x-45)



We get rid of parentheses

-3x+45-90=0

We add all the numbers together, and all the variables

-3x-45=0

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

-3x=45

x=45/-3

x=-15

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