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(3x+1)+(x+9)=180
We move all terms to the left:
(3x+1)+(x+9)-(180)=0
We get rid of parentheses
3x+x+1+9-180=0
We add all the numbers together, and all the variables
4x-170=0
We move all terms containing x to the left, all other terms to the right
4x=170
x=170/4
x=42+1/2
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