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b in (-oo:+oo)
9 = (4/7)*b-((4/7)*b)+9 // - (4/7)*b-((4/7)*b)+9
(4/7)*b-((4/7)*b)-9+9 = 0
(-4/7)*b+(4/7)*b-9+9 = 0
0 = 0
b naleu017Cy do R
b in (-oo:+oo)
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