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