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10(n-100)=-20
We move all terms to the left:
10(n-100)-(-20)=0
We add all the numbers together, and all the variables
10(n-100)+20=0
We multiply parentheses
10n-1000+20=0
We add all the numbers together, and all the variables
10n-980=0
We move all terms containing n to the left, all other terms to the right
10n=980
n=980/10
n=98
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