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x in (-oo:+oo)
4 = 5*x-x+1 // - 5*x-x+1
x-(5*x)-1+4 = 0
x-5*x-1+4 = 0
3-4*x = 0 // - 3
-4*x = -3 // : -4
x = -3/(-4)
x = 3/4
x = 3/4
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