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1+3.1a-6.1a=5.5
We move all terms to the left:
1+3.1a-6.1a-(5.5)=0
We add all the numbers together, and all the variables
-3a-4.5=0
We move all terms containing a to the left, all other terms to the right
-3a=4.5
a=4.5/-3
a=-1+1/2
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