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-3.2+5a=90
We move all terms to the left:
-3.2+5a-(90)=0
We add all the numbers together, and all the variables
5a-93.2=0
We move all terms containing a to the left, all other terms to the right
5a=93.2
a=93.2/5
a=18+2.6666666666667/4.1666666666667
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