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(x+70)+(x+20)=180
We move all terms to the left:
(x+70)+(x+20)-(180)=0
We get rid of parentheses
x+x+70+20-180=0
We add all the numbers together, and all the variables
2x-90=0
We move all terms containing x to the left, all other terms to the right
2x=90
x=90/2
x=45
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