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x in (-oo:+oo)
(-5/8)*x = 2/3 // - 2/3
(-5/8)*x-(2/3) = 0
(-5/8)*x-2/3 = 0
-5/8*x-2/3 = 0 // + 2/3
-5/8*x = 2/3 // : -5/8
x = 2/3/(-5/8)
x = -16/15
x = -16/15
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