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(3x+1)+(x+3)=180
We move all terms to the left:
(3x+1)+(x+3)-(180)=0
We get rid of parentheses
3x+x+1+3-180=0
We add all the numbers together, and all the variables
4x-176=0
We move all terms containing x to the left, all other terms to the right
4x=176
x=176/4
x=44
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