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x in (-oo:+oo)
a-(3*a)-(a*((9*b)/2))+a*((8*b)/2) = 0
a-3*a+(-9/2)*a*b+a*((8*b)/2) = 0
-2*a-1/2*a*b = 0
x naleu017Cy do R
x in (-oo:+oo)
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