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d in (-oo:+oo)
2*(5*d+8) = -4 // + 4
2*(5*d+8)+4 = 0
2*(5*d+8)+4 = 0
10*d+20 = 0
10*d+20 = 0
10*d+20 = 0 // - 20
10*d = -20 // : 10
d = -20/10
d = -2
d = -2
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