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19=a7.2
We move all terms to the left:
19-(a7.2)=0
We add all the numbers together, and all the variables
-(+a7.2)+19=0
We get rid of parentheses
-a7.2+19=0
We move all terms containing a to the left, all other terms to the right
-a7.2=-19
a=-19/1
a=-19
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