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200=2n+5n
We move all terms to the left:
200-(2n+5n)=0
We add all the numbers together, and all the variables
-(+7n)+200=0
We get rid of parentheses
-7n+200=0
We move all terms containing n to the left, all other terms to the right
-7n=-200
n=-200/-7
n=28+4/7
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