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b in (-oo:+oo)
5*(6*b-9) = 135 // - 135
5*(6*b-9)-135 = 0
5*(6*b-9)-135 = 0
30*b-180 = 0
30*b-180 = 0
30*b-180 = 0 // + 180
30*b = 180 // : 30
b = 180/30
b = 6
b = 6
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