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x in (-oo:+oo)
5/2 = (x/1)/7 // - (x/1)/7
5/2-((x/1)/7) = 0
5/2-(x/7) = 0
5/2-1/7*x = 0 // - 5/2
-1/7*x = -5/2 // : -1/7
x = -5/2/(-1/7)
x = 35/2
x = 35/2
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