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d in (-oo:+oo)
4-6*d = 4*d-96 // - 4*d-96
4-6*d-(4*d)+96 = 0
4-6*d-4*d+96 = 0
100-10*d = 0 // - 100
-10*d = -100 // : -10
d = -100/(-10)
d = 10
d = 10
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