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b in (-oo:+oo)
5*(6*b+2) = -80 // + 80
5*(6*b+2)+80 = 0
5*(6*b+2)+80 = 0
30*b+90 = 0
30*b+90 = 0
30*b+90 = 0 // - 90
30*b = -90 // : 30
b = -90/30
b = -3
b = -3
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