Express the given logarithm as a sum and/or difference of logarithms. Simplify, if possible. Assume that all variables represent positive real numbers.log5 
A. 7 log5x - 6 log5y - log57
B. (7 log5x)(6 log5y) - log57
C. 7 log5x + 6 log5y + log57
D. 7 log5x + 6 log5y - log57
Answer: D
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