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d in (-oo:+oo)
-13 = (1/4)*d-45 // - (1/4)*d-45
45-((1/4)*d)-13 = 0
(-1/4)*d-13+45 = 0
32-1/4*d = 0 // - 32
-1/4*d = -32 // : -1/4
d = -32/(-1/4)
d = 128
d = 128
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