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d in (-oo:+oo)
5*(4*d-6) = 150 // - 150
5*(4*d-6)-150 = 0
5*(4*d-6)-150 = 0
20*d-180 = 0
20*d-180 = 0
20*d-180 = 0 // + 180
20*d = 180 // : 20
d = 180/20
d = 9
d = 9
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