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x in (-oo:+oo)
x^2*((16*y^9)/7)+((21*x^4)/8)*y^3 = 0
16/7*x^2*y^9+21/8*x^4*y^3 = 0
t_1 = x^2
21/8*t_1^2*y^3+16/7*t_1^1*y^9 = 0
21/8*t_1^2*y^3+16/7*t_1*y^9 = 0
DELTA = (16/7*y^9)^2-(0*21/8*4*y^3)
DELTA = 256/49*y^18
256/49*y^18 = 0
256/49*y^18 = 0 // : 256/49
y^18 = 0
y = 0
DELTA = 0 <=> t_2 = 0
t_1 = (-(16/7*y^9))/(2*21/8*y^3) i y = 0
t_1 = -64/147*y^6 i y = 0
( t_1 = ((256/49*y^18)^(1/2)-(16/7*y^9))/(2*21/8*y^3) or t_1 = (-(16/7*y^9)-(256/49*y^18)^(1/2))/(2*21/8*y^3) ) i y > 0
( t_1 = 0 or t_1 = -128/147*y^6 ) i y > 0
y+0 > 0
y > 0
y+0 > 0 // - 0
y > 0
t_1 = -64/147*y^6
x^2-(-64/147*y^6) = 0
x^2+64/147*y^6 = 0
1*x^2 = -(64/147*y^6) // : 1
x^2 = -64/147*y^6
x^2 = -64/147*y^6 // ^ 1/2
abs(x) = (-64/147)^(1/2)*y^3
x = (-64/147)^(1/2)*y^3 or x = -((-64/147)^(1/2)*y^3)
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
t_1 = -128/147*y^6
x^2-(-128/147*y^6) = 0
x^2+128/147*y^6 = 0
1*x^2 = -(128/147*y^6) // : 1
x^2 = -128/147*y^6
x^2 = -128/147*y^6 // ^ 1/2
abs(x) = (-128/147)^(1/2)*y^3
x = (-128/147)^(1/2)*y^3 or x = -((-128/147)^(1/2)*y^3)
x in { (-64/147)^(1/2)*y^3, -((-64/147)^(1/2)*y^3), 0, (-128/147)^(1/2)*y^3, -((-128/147)^(1/2)*y^3) }
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