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15c+20(c+5)=415
We move all terms to the left:
15c+20(c+5)-(415)=0
We multiply parentheses
15c+20c+100-415=0
We add all the numbers together, and all the variables
35c-315=0
We move all terms containing c to the left, all other terms to the right
35c=315
c=315/35
c=9
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