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778.4=11.2a
We move all terms to the left:
778.4-(11.2a)=0
We add all the numbers together, and all the variables
-(+11.2a)+778.4=0
We get rid of parentheses
-11.2a+778.4=0
We move all terms containing a to the left, all other terms to the right
-11.2a=-778.4
a=-778.4/-11.2
a=69+3.5/6.9999999999999
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