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d in (-oo:+oo)
3/4-(6*d) = 75/4 // - 75/4
3/4-(6*d)-(75/4) = 0
3/4-6*d-75/4 = 0
-6*d-18 = 0 // + 18
-6*d = 18 // : -6
d = 18/(-6)
d = -3
d = -3
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