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3(2c+3)=-15
We move all terms to the left:
3(2c+3)-(-15)=0
We add all the numbers together, and all the variables
3(2c+3)+15=0
We multiply parentheses
6c+9+15=0
We add all the numbers together, and all the variables
6c+24=0
We move all terms containing c to the left, all other terms to the right
6c=-24
c=-24/6
c=-4
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