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3*5-(5*x)-8*x^2*((5*y)/3) = 0
3*5-5*x-8*x^2*((5*y)/3) = 0
15-5*x-40/3*x^2*y = 0
DELTA = (-5)^2-(-40/3*4*15*y)
DELTA = 800*y+25
800*y+25 = 0
800*y+25 = 0 // - 25
800*y = -25 // : 800
y = -25/800
y = -1/32
DELTA = 0 <=> t_1 = -1/32
x = 5/(-40/3*2*y) i y = -1/32
x = -3/16*y^-1 i y = -1/32
( x = ((800*y+25)^(1/2)+5)/(-40/3*2*y) or x = (5-(800*y+25)^(1/2))/(-40/3*2*y) ) i y > -1/32
( x = -3/80*y^-1*((800*y+25)^(1/2)+5) or x = -3/80*y^-1*(5-(800*y+25)^(1/2)) ) i y > -1/32
y+1/32 > 0
y+1/32 > 0 // - 1/32
y > -1/32
x in { -3/16*y^-1, -3/80*y^-1*((800*y+25)^(1/2)+5), -3/80*y^-1*(5-(800*y+25)^(1/2)) }
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