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d in (-oo:+oo)
(-3/7)*d-(3/7) = d-103/7 // - d-103/7
(-3/7)*d-d-(3/7)-(-103/7) = 0
(-3/7)*d-d-3/7+103/7 = 0
100/7-10/7*d = 0 // - 100/7
-10/7*d = -100/7 // : -10/7
d = -100/7/(-10/7)
d = 10
d = 10
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