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100=2n+4
We move all terms to the left:
100-(2n+4)=0
We get rid of parentheses
-2n-4+100=0
We add all the numbers together, and all the variables
-2n+96=0
We move all terms containing n to the left, all other terms to the right
-2n=-96
n=-96/-2
n=+48
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