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b in (-oo:+oo)
5*(6*b-3) = 225 // - 225
5*(6*b-3)-225 = 0
5*(6*b-3)-225 = 0
30*b-240 = 0
30*b-240 = 0
30*b-240 = 0 // + 240
30*b = 240 // : 30
b = 240/30
b = 8
b = 8
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