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d in (-oo:+oo)
2*(4*d+8) = -32 // + 32
2*(4*d+8)+32 = 0
2*(4*d+8)+32 = 0
8*d+48 = 0
8*d+48 = 0
8*d+48 = 0 // - 48
8*d = -48 // : 8
d = -48/8
d = -6
d = -6
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