(3x+1)+(7x-1)+90=180

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Solution for (3x+1)+(7x-1)+90=180 equation: 



(3x+1)+(7x-1)+90=180

We move all terms to the left:

(3x+1)+(7x-1)+90-(180)=0

We add all the numbers together, and all the variables

(3x+1)+(7x-1)-90=0

We get rid of parentheses

3x+7x+1-1-90=0

We add all the numbers together, and all the variables

10x-90=0

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

10x=90

x=90/10

x=9

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