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2a-18.6+a-2.5+a+2.4=18.5
We move all terms to the left:
2a-18.6+a-2.5+a+2.4-(18.5)=0
We add all the numbers together, and all the variables
4a-37.2=0
We move all terms containing a to the left, all other terms to the right
4a=37.2
a=37.2/4
a=9+1/3.3333333333333
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