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+4(N-3)=18
We move all terms to the left:
+4(N-3)-(18)=0
We multiply parentheses
4N-12-18=0
We add all the numbers together, and all the variables
4N-30=0
We move all terms containing N to the left, all other terms to the right
4N=30
N=30/4
N=7+1/2
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