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-4.3c=-21.5
We move all terms to the left:
-4.3c-(-21.5)=0
We add all the numbers together, and all the variables
-4.3c+21.5=0
We move all terms containing c to the left, all other terms to the right
-4.3c=-21.5
c=-21.5/-4.3
c=+5
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