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x in (-oo:+oo)
23-((2/7)*x) = (-2/7)*x+23 // - (-2/7)*x+23
23-((2/7)*x)-((-2/7)*x)-23 = 0
(-2/7)*x+(2/7)*x-23+23 = 0
0 = 0
x naleu017Cy do R
x in (-oo:+oo)
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