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-18=a/4
We move all terms to the left:
-18-(a/4)=0
We add all the numbers together, and all the variables
-(+a/4)-18=0
We get rid of parentheses
-a/4-18=0
We multiply all the terms by the denominator
-a-18*4=0
We add all the numbers together, and all the variables
-1a-72=0
We move all terms containing a to the left, all other terms to the right
-a=72
a=72/-1
a=-72
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