-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(-1x+20))-90=0



We calculate terms in parentheses: -(-3(-1x+20)), so:

-3(-1x+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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