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12.2a=79.3
We move all terms to the left:
12.2a-(79.3)=0
We add all the numbers together, and all the variables
12.2a-79.3=0
We move all terms containing a to the left, all other terms to the right
12.2a=79.3
a=79.3/12.2
a=6+1/2
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