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d in (-oo:+oo)
(-3/4)*(12-(16*d)) = 0
(-3/4)*(12-16*d) = 0
-3/4*(12-16*d) = 0
12-16*d = 0 // - 12
-16*d = -12 // : -16
d = -12/(-16)
d = 3/4
d = 3/4
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