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b in (-oo:+oo)
(5/7)*b-9 = (5/7)*b-9 // - (5/7)*b-9
(5/7)*b-((5/7)*b)-9+9 = 0
(5/7)*b+(-5/7)*b-9+9 = 0
0 = 0
b naleu017Cy do R
b in (-oo:+oo)
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