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d in (-oo:+oo)
2-(5*d) = -7*d-16 // + -7*d-16
2-(5*d)-(-7*d)+16 = 0
7*d-5*d+2+16 = 0
2*d+18 = 0 // - 18
2*d = -18 // : 2
d = -18/2
d = -9
d = -9
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