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2(a-8.5)-2.6=3.1a+
We move all terms to the left:
2(a-8.5)-2.6-(3.1a+)=0
We add all the numbers together, and all the variables
2(a-8.5)-(+3.1a)-2.6=0
We multiply parentheses
2a-(+3.1a)-17-2.6=0
We get rid of parentheses
2a-3.1a-17-2.6=0
We add all the numbers together, and all the variables
-1.1a-19.6=0
We move all terms containing a to the left, all other terms to the right
-1.1a=19.6
a=19.6/-1.1
a=-17+0.9/1.1
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