3x=(90+x)

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



3x=(90+x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -((x+90)), so:

(x+90)

We get rid of parentheses

x+90

Back to the equation:

-(x+90)



We get rid of parentheses

3x-x-90=0

We add all the numbers together, and all the variables

2x-90=0

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

2x=90

x=90/2

x=45

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