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x in (-oo:+oo)
(5*x)/(-2) = 10 // - 10
(5*x)/(-2)-10 = 0
-5/2*x-10 = 0 // + 10
-5/2*x = 10 // : -5/2
x = 10/(-5/2)
x = -4
x = -4
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