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200=70x+100
We move all terms to the left:
200-(70x+100)=0
We get rid of parentheses
-70x-100+200=0
We add all the numbers together, and all the variables
-70x+100=0
We move all terms containing x to the left, all other terms to the right
-70x=-100
x=-100/-70
x=1+3/7
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