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13.4+6.5a=7.9a+3.6
We move all terms to the left:
13.4+6.5a-(7.9a+3.6)=0
We get rid of parentheses
6.5a-7.9a-3.6+13.4=0
We add all the numbers together, and all the variables
-1.4a+9.8=0
We move all terms containing a to the left, all other terms to the right
-1.4a=-9.8
a=-9.8/-1.4
a=7+1.7763568394003E-15/1.4
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