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9=8c-15c
We move all terms to the left:
9-(8c-15c)=0
We add all the numbers together, and all the variables
-(-7c)+9=0
We get rid of parentheses
7c+9=0
We move all terms containing c to the left, all other terms to the right
7c=-9
c=-9/7
c=-1+2/7
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