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x in (-oo:+oo)
a*((3*b)/4)+a*((5*c)/7) = 2 // - 2
a*((3*b)/4)+a*((5*c)/7)-2 = 0
3/4*a*b+5/7*a*c-2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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