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x in (-oo:+oo)
(x^2)/100-((y^2*z^4)/81) = 0
1/100*x^2 = -(-1/81*y^2*z^4) // : 1/100
x^2 = 100/81*y^2*z^4
x^2 = 100/81*y^2*z^4 // ^ 1/2
abs(x) = 10/9*y*z^2
x = 10/9*y*z^2 or x = -(10/9*y*z^2)
x in { 10/9*y*z^2, -(10/9*y*z^2) }
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