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b in (-oo:+oo)
15*((1/3)*b+3) = 6*(b+9) // - 6*(b+9)
15*((1/3)*b+3)-(6*(b+9)) = 0
15*((1/3)*b+3)-6*(b+9) = 0
15*(1/3*b+3)-6*(b+9) = 0
15*(1/3*b+3)-6*(b+9) = 0
-b-9 = 0
-b-9 = 0
-b-9 = 0 // + 9
-b = 9 // * -1
b = -9
b = -9
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