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2.6(2a-1)=3.1a+10
We move all terms to the left:
2.6(2a-1)-(3.1a+10)=0
We multiply parentheses
5.2a-(3.1a+10)-2.6=0
We get rid of parentheses
5.2a-3.1a-10-2.6=0
We add all the numbers together, and all the variables
2.1a-12.6=0
We move all terms containing a to the left, all other terms to the right
2.1a=12.6
a=12.6/2.1
a=6+-1.7763568394003E-15/2.1
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