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d in (-oo:+oo)
6-5*d = 4*d-30 // - 4*d-30
6-5*d-(4*d)+30 = 0
6-5*d-4*d+30 = 0
36-9*d = 0 // - 36
-9*d = -36 // : -9
d = -36/(-9)
d = 4
d = 4
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