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x in (-oo:+oo)
x^2-((14/5)*(x-7))-(5*x) = 0
(-14/5)*(x-7)+x^2-5*x = 0
x^2-14/5*(x-7)-5*x = 0
x^2-14/5*(x-7)-5*x = 0
x^2-14/5*x-5*x+98/5 = 0
x^2-39/5*x+98/5 = 0
x^2-39/5*x+98/5 = 0
x^2-39/5*x+98/5 = 0
DELTA = (-39/5)^2-(1*4*98/5)
DELTA = -439/25
DELTA < 0
1 = 0
1 = 0
x belongs to the empty set
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