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a+c = 12
b + c =15
c = 15 -b
c= 15 -(10-a)
c = 15 -(10-(12-c))
c = 15 -(10-12+c)
c = 15 -10+12 -c
C = 27-10 - c
c = 17 -c
2c = 17
c = 17/2
c = 8.5