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X in (-oo:+oo)
(12*X)/7+12 = X+(5*X)/7+12 // - X+(5*X)/7+12
(12*X)/7-X-((5*X)/7)-12+12 = 0
(12*X)/7-X+(-5/7)*X-12+12 = 0
0 = 0
X naleu017Cy do R
X in (-oo:+oo)
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