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d in (-oo:+oo)
2*d+6 = -6*d-10 // + -6*d-10
2*d-(-6*d)+6+10 = 0
2*d+6*d+6+10 = 0
8*d+16 = 0 // - 16
8*d = -16 // : 8
d = -16/8
d = -2
d = -2
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