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x in (-oo:+oo)
b*((a+b)/15)-(b*((4*a+b)/15)) = 0
(b*(a+b))/15+(-1*b*(4*a+b))/15 = 0
b*(a+b)-1*b*(4*a+b) = 0
-3*a*b = 0
(-3*a*b)/15 = 0
(-3*a*b)/15 = 0 // * 15
-3*a*b = 0
x belongs to the empty set
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