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d in (-oo:+oo)
(-3/7)*d+7 = 2*d+443/56 // - 2*d+443/56
(-3/7)*d-(2*d)-(443/56)+7 = 0
(-3/7)*d-2*d-443/56+7 = 0
-17/7*d-51/56 = 0 // + 51/56
-17/7*d = 51/56 // : -17/7
d = 51/56/(-17/7)
d = -3/8
d = -3/8
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