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D in (-oo:+oo)
D/6-(7/5) = 0
D/6-7/5 = 0
1/6*D-7/5 = 0 // + 7/5
1/6*D = 7/5 // : 1/6
D = 7/5/1/6
D = 42/5
D = 42/5
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