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10+8c+15=-2c=40
We move all terms to the left:
10+8c+15-(-2c)=0
We add all the numbers together, and all the variables
8c-(-2c)+25=0
We get rid of parentheses
8c+2c+25=0
We add all the numbers together, and all the variables
10c+25=0
We move all terms containing c to the left, all other terms to the right
10c=-25
c=-25/10
c=-2+1/2
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