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x in (-oo:+oo)
5/2-(5*x) = 4-x-1 // - 4-x-1
x-(5*x)+5/2-4+1 = 0
x-5*x+5/2-4+1 = 0
-4*x-1/2 = 0 // + 1/2
-4*x = 1/2 // : -4
x = 1/2/(-4)
x = -1/8
x = -1/8
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