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x in (-oo:+oo)
((-3*x)/4)*x = ((1*x)/8)*x-14 // - ((1*x)/8)*x-14
((-3*x)/4)*x-(((1*x)/8)*x)+14 = 0
((-3*x)/4)*x+(-1/8)*x^2+14 = 0
-7/8*x^2 = -14 // : -7/8
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x in { 4, -4 }
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