7 power - 20 minus 7 power -21
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(7^-20)-(7^-21)
=(1/7^20)-(1/7^21)
=(7/7^21)-(1/7^21)
=(7-1/7^21)
=6/7^21
=(1/7^20)-(1/7^21)
=(7/7^21)-(1/7^21)
=(7-1/7^21)
=6/7^21
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