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x in (-oo:+oo)
((-3*(2/5))/10)*x = 5 // - 5
((-3*(2/5))/10)*x-5 = 0
-3/25*x-5 = 0 // + 5
-3/25*x = 5 // : -3/25
x = 5/(-3/25)
x = -125/3
x = -125/3
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