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(10x-10)+(30x+30)=180
We move all terms to the left:
(10x-10)+(30x+30)-(180)=0
We get rid of parentheses
10x+30x-10+30-180=0
We add all the numbers together, and all the variables
40x-160=0
We move all terms containing x to the left, all other terms to the right
40x=160
x=160/40
x=4
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