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(3x+10)+(x-20)=180
We move all terms to the left:
(3x+10)+(x-20)-(180)=0
We get rid of parentheses
3x+x+10-20-180=0
We add all the numbers together, and all the variables
4x-190=0
We move all terms containing x to the left, all other terms to the right
4x=190
x=190/4
x=47+1/2
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