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(3x+-10)+(x+20)=180
We move all terms to the left:
(3x+-10)+(x+20)-(180)=0
We add all the numbers together, and all the variables
(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-170=0
We move all terms containing x to the left, all other terms to the right
4x=170
x=170/4
x=42+1/2
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