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(2x-30)+x+(x+220)=710
We move all terms to the left:
(2x-30)+x+(x+220)-(710)=0
We add all the numbers together, and all the variables
x+(2x-30)+(x+220)-710=0
We get rid of parentheses
x+2x+x-30+220-710=0
We add all the numbers together, and all the variables
4x-520=0
We move all terms containing x to the left, all other terms to the right
4x=520
x=520/4
x=130
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