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x in (-oo:+oo)
8*x-(((4*x)/3)*x) = 28 // - 28
8*x-(((4*x)/3)*x)-28 = 0
(-4/3)*x^2+8*x-28 = 0
8*x-4/3*x^2-28 = 0
DELTA = 8^2-(-28*(-4/3)*4)
DELTA = -256/3
DELTA < 0
x belongs to the empty set
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