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d in (-oo:+oo)
5*d+1/4 = -9/4 // + -9/4
5*d+1/4-(-9/4) = 0
5*d+1/4+9/4 = 0
5*d+5/2 = 0 // - 5/2
5*d = -5/2 // : 5
d = -5/2/5
d = -1/2
d = -1/2
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