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12=a+7.9
We move all terms to the left:
12-(a+7.9)=0
We get rid of parentheses
-a-7.9+12=0
We add all the numbers together, and all the variables
-1a+4.1=0
We move all terms containing a to the left, all other terms to the right
-a=-4.1
a=-4.1/-1
a=4+0.1/1
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