(90-x)=(3x+15)

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Solution for (90-x)=(3x+15) equation: 



(90-x)=(3x+15)

We move all terms to the left:

(90-x)-((3x+15))=0

We add all the numbers together, and all the variables

(-1x+90)-((3x+15))=0

We get rid of parentheses

-1x-((3x+15))+90=0



We calculate terms in parentheses: -((3x+15)), so:

(3x+15)

We get rid of parentheses

3x+15

Back to the equation:

-(3x+15)



We get rid of parentheses

-1x-3x-15+90=0

We add all the numbers together, and all the variables

-4x+75=0

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

-4x=-75

x=-75/-4

x=18+3/4

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