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89=9+-16c
We move all terms to the left:
89-(9+-16c)=0
We add all the numbers together, and all the variables
-(-16c)+89=0
We get rid of parentheses
16c+89=0
We move all terms containing c to the left, all other terms to the right
16c=-89
c=-89/16
c=-5+9/16
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