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6a+4=20.2
We move all terms to the left:
6a+4-(20.2)=0
We add all the numbers together, and all the variables
6a-16.2=0
We move all terms containing a to the left, all other terms to the right
6a=16.2
a=16.2/6
a=2+1.9090909090909/2.7272727272727
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