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(25*x)^2+(9/5)*x+3 = 5*x+3 // - 5*x+3
(25*x)^2+(9/5)*x-(5*x)-3+3 = 0
(25*x)^2+(9/5)*x-5*x-3+3 = 0
625*x^2-16/5*x = 0
DELTA = (-16/5)^2-(0*4*625)
DELTA = 256/25
DELTA > 0
x = ((256/25)^(1/2)+16/5)/(2*625) or x = (16/5-(256/25)^(1/2))/(2*625)
x = 16/3125 or x = 0
x in { 0, 16/3125 }
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