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d in (-oo:+oo)
7*d+3/10 = (1/6)*d+107/15 // - (1/6)*d+107/15
7*d-((1/6)*d)+3/10-(107/15) = 0
7*d+(-1/6)*d+3/10-107/15 = 0
41/6*d-41/6 = 0 // + 41/6
41/6*d = 41/6 // : 41/6
d = 41/6/41/6
d = 1
d = 1
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