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d in (-oo:+oo)
(1/4)*(d-3) = -15 // + 15
(1/4)*(d-3)+15 = 0
1/4*(d-3)+15 = 0
1/4*(d-3)+15 = 0
1/4*d+57/4 = 0
1/4*d+57/4 = 0
1/4*d+57/4 = 0 // - 57/4
1/4*d = -57/4 // : 1/4
d = -57/4/1/4
d = -57
d = -57
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