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(-1)*(-15) = +15 so -15 = + 15/(-1)
So 15/(d-7) - 15/(7-d) = 15/(d-7) + 15/[(-1)*(7-d)]
= 15/(d-7) +15/[-7+d] = 15/(d-7) + 15/(d-7) = 30/(d-7)
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∙ 14y ago
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