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90+(x+2)+(2x+3)=180
We move all terms to the left:
90+(x+2)+(2x+3)-(180)=0
We add all the numbers together, and all the variables
(x+2)+(2x+3)-90=0
We get rid of parentheses
x+2x+2+3-90=0
We add all the numbers together, and all the variables
3x-85=0
We move all terms containing x to the left, all other terms to the right
3x=85
x=85/3
x=28+1/3
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