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6.4=4c-2
We move all terms to the left:
6.4-(4c-2)=0
We get rid of parentheses
-4c+2+6.4=0
We add all the numbers together, and all the variables
-4c+8.4=0
We move all terms containing c to the left, all other terms to the right
-4c=-8.4
c=-8.4/-4
c=2+0.4/4
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