90=(x+12)+5x

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Solution for 90=(x+12)+5x equation: 



90=(x+12)+5x

We move all terms to the left:

90-((x+12)+5x)=0



We calculate terms in parentheses: -((x+12)+5x), so:

(x+12)+5x

We add all the numbers together, and all the variables

5x+(x+12)

We get rid of parentheses

5x+x+12

We add all the numbers together, and all the variables

6x+12

Back to the equation:

-(6x+12)



We get rid of parentheses

-6x-12+90=0

We add all the numbers together, and all the variables

-6x+78=0

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

-6x=-78

x=-78/-6

x=+13

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