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x in (-oo:+oo)
71/5 = 4*x // - 4*x
71/5-(4*x) = 0
71/5-4*x = 0
71/5-4*x = 0 // - 71/5
-4*x = -71/5 // : -4
x = -71/5/(-4)
x = 71/20
x = 71/20
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