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