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720=350+x+x
We move all terms to the left:
720-(350+x+x)=0
We add all the numbers together, and all the variables
-(2x+350)+720=0
We get rid of parentheses
-2x-350+720=0
We add all the numbers together, and all the variables
-2x+370=0
We move all terms containing x to the left, all other terms to the right
-2x=-370
x=-370/-2
x=+185
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