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d in (-oo:+oo)
2*d-2 = -7*d-38 // + -7*d-38
2*d-(-7*d)-2+38 = 0
2*d+7*d-2+38 = 0
9*d+36 = 0 // - 36
9*d = -36 // : 9
d = -36/9
d = -4
d = -4
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