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D in (-oo:+oo)
D/4 = 6.7 // - 6.7
D/4-6.7 = 0
1/4*D-6.7 = 0 // + 6.7
1/4*D = 6.7 // : 1/4
D = 6.7/1/4
D = 26.8
D = 26.8
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