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D in (-oo:+oo)
D/42 = 49/147 // - 49/147
D/42-(49/147) = 0
D/42-1/3 = 0
1/42*D-1/3 = 0 // + 1/3
1/42*D = 1/3 // : 1/42
D = 1/3/1/42
D = 14
D = 14
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