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d in (-oo:+oo)
(-1/2)*d+2 = -4*d-(41/2) // + -4*d-(41/2)
(-1/2)*d-(-4*d)+41/2+2 = 0
(-1/2)*d+4*d+41/2+2 = 0
7/2*d+45/2 = 0 // - 45/2
7/2*d = -45/2 // : 7/2
d = -45/2/7/2
d = -45/7
d = -45/7
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