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d in (-oo:+oo)
1.7 = d/21 // - d/21
1.7-(d/21) = 0
1.7-1/21*d = 0 // - 1.7
-1/21*d = -1.7 // : -1/21
d = -1.7/(-1/21)
d = 35.69999822
d = 35.69999822
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