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(3x+1)+(8x-21)=180
We move all terms to the left:
(3x+1)+(8x-21)-(180)=0
We get rid of parentheses
3x+8x+1-21-180=0
We add all the numbers together, and all the variables
11x-200=0
We move all terms containing x to the left, all other terms to the right
11x=200
x=200/11
x=18+2/11
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