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x in (-oo:+oo)
x+(2*x)/7-3 = (9*x)/7-3 // - (9*x)/7-3
x+(2*x)/7-((9*x)/7)-3+3 = 0
x+(2*x)/7+(-9/7)*x-3+3 = 0
0 = 0
x naleu017Cy do R
x in (-oo:+oo)
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