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x in (-oo:+oo)
(-7/8)*x = 5 // - 5
(-7/8)*x-5 = 0
-7/8*x-5 = 0 // + 5
-7/8*x = 5 // : -7/8
x = 5/(-7/8)
x = -40/7
x = -40/7
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