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x in (-oo:+oo)
(-5/8)*x = 4/5 // - 4/5
(-5/8)*x-(4/5) = 0
(-5/8)*x-4/5 = 0
-5/8*x-4/5 = 0 // + 4/5
-5/8*x = 4/5 // : -5/8
x = 4/5/(-5/8)
x = -32/25
x = -32/25
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