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d in (-oo:+oo)
4*d+5/6 = (-2/7)*d+2195/42 // - (-2/7)*d+2195/42
4*d-((-2/7)*d)+5/6-(2195/42) = 0
4*d+(2/7)*d+5/6-2195/42 = 0
30/7*d-360/7 = 0 // + 360/7
30/7*d = 360/7 // : 30/7
d = 360/7/30/7
d = 12
d = 12
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