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b in (-oo:+oo)
3*(5*b-10) = -180 // + 180
3*(5*b-10)+180 = 0
3*(5*b-10)+180 = 0
15*b+150 = 0
15*b+150 = 0
15*b+150 = 0 // - 150
15*b = -150 // : 15
b = -150/15
b = -10
b = -10
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