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b in (-oo:+oo)
-(3*b-15) = 6*((2*b)/5) // - 6*((2*b)/5)
15-(3*b)-(6*((2*b)/5)) = 0
(-12/5)*b-3*b+15 = 0
15-27/5*b = 0 // - 15
-27/5*b = -15 // : -27/5
b = -15/(-27/5)
b = 25/9
b = 25/9
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