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-a/5=3
We move all terms to the left:
-a/5-(3)=0
We multiply all the terms by the denominator
-a-3*5=0
We add all the numbers together, and all the variables
-1a-15=0
We move all terms containing a to the left, all other terms to the right
-a=15
a=15/-1
a=-15
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