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