-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-30=0

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

3x=30

x=30/3

x=10

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