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7c+10c+(-9c)=-16
We move all terms to the left:
7c+10c+(-9c)-(-16)=0
We add all the numbers together, and all the variables
17c+(-9c)+16=0
We get rid of parentheses
17c-9c+16=0
We add all the numbers together, and all the variables
8c+16=0
We move all terms containing c to the left, all other terms to the right
8c=-16
c=-16/8
c=-2
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