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d in (-oo:+oo)
4*d-7 = 25/4 // - 25/4
4*d-(25/4)-7 = 0
4*d-25/4-7 = 0
4*d-53/4 = 0 // + 53/4
4*d = 53/4 // : 4
d = 53/4/4
d = 53/16
d = 53/16
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