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x in (-oo:+oo)
g = 21-(((7*t)/3)*t)-9 // - 21-(((7*t)/3)*t)-9
g+((7*t)/3)*t-21+9 = 0
g+7/3*t^2-12 = 0
x naleu017Cy do R
x in (-oo:+oo)
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