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5a-6=2a+15.8
We move all terms to the left:
5a-6-(2a+15.8)=0
We get rid of parentheses
5a-2a-15.8-6=0
We add all the numbers together, and all the variables
3a-21.8=0
We move all terms containing a to the left, all other terms to the right
3a=21.8
a=21.8/3
a=7+0.8/3
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