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X in (-oo:+oo)
X+(2*X)/5-4 = (7*X)/5-4 // - (7*X)/5-4
X+(2*X)/5-((7*X)/5)-4+4 = 0
X+(2*X)/5+(-7/5)*X-4+4 = 0
0 = 0
X naleu017Cy do R
X in (-oo:+oo)
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