y=5−6xy = 5 - 6xy=5−6x的反函数为（ ）.
（A）y=5−6xy = 5 - 6xy=5−6x
（B）y=5+6xy = 5 + 6xy=5+6x
（C）y=5−x6y = \dfrac{5 - x}{6}y=65−x
（D）y=5+x6y = \dfrac{5 + x}{6}y=65+x
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