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(3x-100)+(x-10)+(x-10)=180
We move all terms to the left:
(3x-100)+(x-10)+(x-10)-(180)=0
We get rid of parentheses
3x+x+x-100-10-10-180=0
We add all the numbers together, and all the variables
5x-300=0
We move all terms containing x to the left, all other terms to the right
5x=300
x=300/5
x=60
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