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x in (-oo:+oo)
(3/4)*(4*x-16) = (3/5)*(5*x-15) // - (3/5)*(5*x-15)
(3/4)*(4*x-16)-((3/5)*(5*x-15)) = 0
(3/4)*(4*x-16)+(-3/5)*(5*x-15) = 0
3/4*(4*x-16)-3/5*(5*x-15) = 0
3/4*(4*x-16)-3/5*(5*x-15) = 0
-3 = 0
-3 = 0
x belongs to the empty set
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