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