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18-2.5a=8.6
We move all terms to the left:
18-2.5a-(8.6)=0
We add all the numbers together, and all the variables
-2.5a+9.4=0
We move all terms containing a to the left, all other terms to the right
-2.5a=-9.4
a=-9.4/-2.5
a=3+1/1.3157894736842
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