3x=(x+10)+90

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Solution for 3x=(x+10)+90 equation: 



3x=(x+10)+90

We move all terms to the left:

3x-((x+10)+90)=0



We calculate terms in parentheses: -((x+10)+90), so:

(x+10)+90

We get rid of parentheses

x+10+90

We add all the numbers together, and all the variables

x+100

Back to the equation:

-(x+100)



We get rid of parentheses

3x-x-100=0

We add all the numbers together, and all the variables

2x-100=0

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

2x=100

x=100/2

x=50

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