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18/(-6)=a
We move all terms to the left:
18/(-6)-(a)=0
We add all the numbers together, and all the variables
-1a+18/(-6)=0
We multiply all the terms by the denominator
-1a*(-6)+18=0
We multiply parentheses
6a+18=0
We move all terms containing a to the left, all other terms to the right
6a=-18
a=-18/6
a=-3
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