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108=100-4n
We move all terms to the left:
108-(100-4n)=0
We add all the numbers together, and all the variables
-(-4n+100)+108=0
We get rid of parentheses
4n-100+108=0
We add all the numbers together, and all the variables
4n+8=0
We move all terms containing n to the left, all other terms to the right
4n=-8
n=-8/4
n=-2
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