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2.5+12=5a
We move all terms to the left:
2.5+12-(5a)=0
We add all the numbers together, and all the variables
-5a+14.5=0
We move all terms containing a to the left, all other terms to the right
-5a=-14.5
a=-14.5/-5
a=2+3/3.3333333333333
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