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x in (-oo:+oo)
5/2 = x/(1/7) // - x/(1/7)
5/2-(x/(1/7)) = 0
5/2-7*x = 0
5/2-7*x = 0 // - 5/2
-7*x = -5/2 // : -7
x = -5/2/(-7)
x = 5/14
x = 5/14
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