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x in (-oo:+oo)
x/2-(5*x) = 1 // - 1
x/2-(5*x)-1 = 0
x/2-5*x-1 = 0
-9/2*x-1 = 0 // + 1
-9/2*x = 1 // : -9/2
x = 1/(-9/2)
x = -2/9
x = -2/9
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