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-4a=47.2
We move all terms to the left:
-4a-(47.2)=0
We add all the numbers together, and all the variables
-4a-47.2=0
We move all terms containing a to the left, all other terms to the right
-4a=47.2
a=47.2/-4
a=-11+2.6666666666667/3.3333333333333
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