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12.9a+10=34+9.9a
We move all terms to the left:
12.9a+10-(34+9.9a)=0
We add all the numbers together, and all the variables
12.9a-(9.9a+34)+10=0
We get rid of parentheses
12.9a-9.9a-34+10=0
We add all the numbers together, and all the variables
3a-24=0
We move all terms containing a to the left, all other terms to the right
3a=24
a=24/3
a=8
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