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d in (-oo:+oo)
(2/7)*d+8/9 = (-3/5)*d-(1394/315) // - (-3/5)*d-(1394/315)
(2/7)*d-((-3/5)*d)+8/9+1394/315 = 0
(2/7)*d+(3/5)*d+8/9+1394/315 = 0
31/35*d+186/35 = 0 // - 186/35
31/35*d = -186/35 // : 31/35
d = -186/35/31/35
d = -6
d = -6
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