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3.8=c-6.4c
We move all terms to the left:
3.8-(c-6.4c)=0
We add all the numbers together, and all the variables
-(-5.4c)+3.8=0
We get rid of parentheses
5.4c+3.8=0
We move all terms containing c to the left, all other terms to the right
5.4c=-3.8
c=-3.8/5.4
c=-2.1111111111111/3
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