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b in (-oo:+oo)
5*(6*b+10) = -130 // + 130
5*(6*b+10)+130 = 0
5*(6*b+10)+130 = 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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