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64.4=7.8a
We move all terms to the left:
64.4-(7.8a)=0
We add all the numbers together, and all the variables
-(+7.8a)+64.4=0
We get rid of parentheses
-7.8a+64.4=0
We move all terms containing a to the left, all other terms to the right
-7.8a=-64.4
a=-64.4/-7.8
a=8+2/7.8
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