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8=0.4c
We move all terms to the left:
8-(0.4c)=0
We add all the numbers together, and all the variables
-(+0.4c)+8=0
We get rid of parentheses
-0.4c+8=0
We move all terms containing c to the left, all other terms to the right
-0.4c=-8
c=-8/-0.4
c=+20
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