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x in (-oo:+oo)
(2/3)*a-((1/6)*a)+(3/5)*b-((3/10)*b) = 0
(2/3)*a+(-1/6)*a+(3/5)*b+(-3/10)*b = 0
1/2*a+3/10*b = 0
x naleu017Cy do R
x in (-oo:+oo)
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