-90=3(20+x)

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Solution for -90=3(20+x) equation: 



-90=3(20+x)

We move all terms to the left:

-90-(3(20+x))=0

We add all the numbers together, and all the variables

-(3(x+20))-90=0



We calculate terms in parentheses: -(3(x+20)), so:

3(x+20)

We multiply parentheses

3x+60

Back to the equation:

-(3x+60)



We get rid of parentheses

-3x-60-90=0

We add all the numbers together, and all the variables

-3x-150=0

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

-3x=150

x=150/-3

x=-50

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