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x in (-oo:+oo)
9*u-(u^2*((9*v)/12))-(12*v^2) = 0
9*u+(-3/4)*u^2*v-12*v^2 = 0
9*u-12*v^2-3/4*u^2*v = 0
x naleu017Cy do R
x in (-oo:+oo)
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