90=(4x-10)+(2x-20)

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Solution for 90=(4x-10)+(2x-20) equation: 



90=(4x-10)+(2x-20)

We move all terms to the left:

90-((4x-10)+(2x-20))=0



We calculate terms in parentheses: -((4x-10)+(2x-20)), so:

(4x-10)+(2x-20)

We get rid of parentheses

4x+2x-10-20

We add all the numbers together, and all the variables

6x-30

Back to the equation:

-(6x-30)



We get rid of parentheses

-6x+30+90=0

We add all the numbers together, and all the variables

-6x+120=0

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

-6x=-120

x=-120/-6

x=+20

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