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d in (-oo:+oo)
(2/5)*d+(3/7)*d-3 = -366/35 // + -366/35
(2/5)*d+(3/7)*d-(-366/35)-3 = 0
(2/5)*d+(3/7)*d+366/35-3 = 0
29/35*d+261/35 = 0 // - 261/35
29/35*d = -261/35 // : 29/35
d = -261/35/29/35
d = -9
d = -9
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