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-1c+15=40+c-7
We move all terms to the left:
-1c+15-(40+c-7)=0
We add all the numbers together, and all the variables
-1c-(c+33)+15=0
We get rid of parentheses
-1c-c-33+15=0
We add all the numbers together, and all the variables
-2c-18=0
We move all terms containing c to the left, all other terms to the right
-2c=18
c=18/-2
c=-9
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