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12.500-6.500=a.a=
We move all terms to the left:
12.500-6.500-(a.a)=0
We add all the numbers together, and all the variables
-(+a.a)+12.500-6.500=0
We add all the numbers together, and all the variables
-(+a.a)+6=0
We get rid of parentheses
-a.a+6=0
We move all terms containing a to the left, all other terms to the right
-a.a=-6
a=-6/1
a=-6
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