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b in (-oo:+oo)
-4 = (2/5)*(9-(2*b)) // - (2/5)*(9-(2*b))
-((2/5)*(9-(2*b)))-4 = 0
(-2/5)*(9-2*b)-4 = 0
-2/5*(9-2*b)-4 = 0
-2/5*(9-2*b)-4 = 0
4/5*b-38/5 = 0
4/5*b-38/5 = 0
4/5*b-38/5 = 0 // + 38/5
4/5*b = 38/5 // : 4/5
b = 38/5/4/5
b = 19/2
b = 19/2
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