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6.4=a+2.4
We move all terms to the left:
6.4-(a+2.4)=0
We get rid of parentheses
-a-2.4+6.4=0
We add all the numbers together, and all the variables
-1a+4=0
We move all terms containing a to the left, all other terms to the right
-a=-4
a=-4/-1
a=+4
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