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n+2n+3n+4n=100000000
We move all terms to the left:
n+2n+3n+4n-(100000000)=0
We add all the numbers together, and all the variables
10n-100000000=0
We move all terms containing n to the left, all other terms to the right
10n=100000000
n=100000000/10
n=10000000
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