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d in (-oo:+oo)
5*(7*d-3) = -50 // + 50
5*(7*d-3)+50 = 0
5*(7*d-3)+50 = 0
35*d+35 = 0
35*d+35 = 0
35*d+35 = 0 // - 35
35*d = -35 // : 35
d = -35/35
d = -1
d = -1
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