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