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x in (-oo:+oo)
(5/7)*x-((5/7)*x)-8 = -8 // + 8
(5/7)*x-((5/7)*x)-8+8 = 0
(5/7)*x+(-5/7)*x-8+8 = 0
0 = 0
x naleu017Cy do R
x in (-oo:+oo)
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