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15=3(2)+c
We move all terms to the left:
15-(3(2)+c)=0
We add all the numbers together, and all the variables
-(c+32)+15=0
We get rid of parentheses
-c-32+15=0
We add all the numbers together, and all the variables
-1c-17=0
We move all terms containing c to the left, all other terms to the right
-c=17
c=17/-1
c=-17
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