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x in (-oo:+oo)
(1*x)/(-5) = -10 // + 10
(1*x)/(-5)+10 = 0
x/(-5)+10 = 0
10-1/5*x = 0 // - 10
-1/5*x = -10 // : -1/5
x = -10/(-1/5)
x = 50
x = 50
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