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