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15=a.6
We move all terms to the left:
15-(a.6)=0
We add all the numbers together, and all the variables
-(+a.6)+15=0
We get rid of parentheses
-a.6+15=0
We move all terms containing a to the left, all other terms to the right
-a.6=-15
a=-15/1
a=-15
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