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d in (-oo:+oo)
4.7 = d/2.1 // - d/2.1
4.7-(d/2.1) = 0
4.7-0.47619048*d = 0
4.7-0.47619048*d = 0 // - 4.7
-0.47619048*d = -4.7 // : -0.47619048
d = -4.7/(-0.47619048)
d = 9.86999992
d = 9.86999992
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