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x+(2x-1)+(3x+1)=180
We move all terms to the left:
x+(2x-1)+(3x+1)-(180)=0
We get rid of parentheses
x+2x+3x-1+1-180=0
We add all the numbers together, and all the variables
6x-180=0
We move all terms containing x to the left, all other terms to the right
6x=180
x=180/6
x=30
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