90=3x+(x+6)

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Solution for 90=3x+(x+6) equation: 



90=3x+(x+6)

We move all terms to the left:

90-(3x+(x+6))=0



We calculate terms in parentheses: -(3x+(x+6)), so:

3x+(x+6)

We get rid of parentheses

3x+x+6

We add all the numbers together, and all the variables

4x+6

Back to the equation:

-(4x+6)



We get rid of parentheses

-4x-6+90=0

We add all the numbers together, and all the variables

-4x+84=0

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

-4x=-84

x=-84/-4

x=+21

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