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d in (-oo:+oo)
1.5/3.5 = d/21 // - d/21
1.5/3.5-(d/21) = 0
0.42857143-1/21*d = 0 // - 0.42857143
-1/21*d = -0.42857143 // : -1/21
d = -0.42857143/(-1/21)
d = 8.99999958
d = 8.99999958
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