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210=-70x+800
We move all terms to the left:
210-(-70x+800)=0
We get rid of parentheses
70x-800+210=0
We add all the numbers together, and all the variables
70x-590=0
We move all terms containing x to the left, all other terms to the right
70x=590
x=590/70
x=8+3/7
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