The n term of an ap is 15 - 7n find its common difference
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an=15-7n
an=a+(n-1)d
15-7n=a+(n-1)d
d=(15-7n-a)/(n-1)
an=a+(n-1)d
15-7n=a+(n-1)d
d=(15-7n-a)/(n-1)
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