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D in (-oo:+oo)
D/3-1.2 = 2.8 // - 2.8
D/3-2.8-1.2 = 0
1/3*D-4 = 0 // + 4
1/3*D = 4 // : 1/3
D = 4/1/3
D = 12
D = 12
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