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x in (-oo:+oo)
(-7/8)*x = -71 // + 71
(-7/8)*x+71 = 0
71-7/8*x = 0 // - 71
-7/8*x = -71 // : -7/8
x = -71/(-7/8)
x = 568/7
x = 568/7
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