Answer:
bc -ad = 3c +r
bc-ad-3c=3c+r-3c
bc-3c-ad=r (cancelling (+3c) and (-3c))
bc-3c-ad+ad=r+ad
bc-3c=r+ad (cancelling (+ad) and (-ad))
c(b-3)=r+ad (take common factor of the left side)
c=(r+ad)÷(b-3)
Explanation:
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