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x in (-oo:+oo)
(2*x)/(-10) = 2/5 // - 2/5
(2*x)/(-10)-(2/5) = 0
(2*x)/(-10)-2/5 = 0
-1/5*x-2/5 = 0 // + 2/5
-1/5*x = 2/5 // : -1/5
x = 2/5/(-1/5)
x = -2
x = -2
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