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x in (-oo:+oo)
(-2/5)*x-1 = 9 // - 9
(-2/5)*x-9-1 = 0
-2/5*x-10 = 0 // + 10
-2/5*x = 10 // : -2/5
x = 10/(-2/5)
x = -25
x = -25
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