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4+3(n-1)=100
We move all terms to the left:
4+3(n-1)-(100)=0
We add all the numbers together, and all the variables
3(n-1)-96=0
We multiply parentheses
3n-3-96=0
We add all the numbers together, and all the variables
3n-99=0
We move all terms containing n to the left, all other terms to the right
3n=99
n=99/3
n=33
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