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5.9+5a=2a+9
We move all terms to the left:
5.9+5a-(2a+9)=0
We get rid of parentheses
5a-2a-9+5.9=0
We add all the numbers together, and all the variables
3a-3.1=0
We move all terms containing a to the left, all other terms to the right
3a=3.1
a=3.1/3
a=1+0.1/3
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