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d in (-oo:+oo)
45 = (1/4)*d // - (1/4)*d
45-((1/4)*d) = 0
(-1/4)*d+45 = 0
45-1/4*d = 0 // - 45
-1/4*d = -45 // : -1/4
d = -45/(-1/4)
d = 180
d = 180
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