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d in (-oo:+oo)
41 = -4*d-(3*d)-1 // + -4*d-(3*d)-1
3*d-(-4*d)+1+41 = 0
4*d+3*d+1+41 = 0
7*d+42 = 0 // - 42
7*d = -42 // : 7
d = -42/7
d = -6
d = -6
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