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x in (-oo:+oo)
-5/2 = 6*x-(2*x)-1 // - 6*x-(2*x)-1
2*x-(6*x)-5/2+1 = 0
2*x-6*x-5/2+1 = 0
-4*x-3/2 = 0 // + 3/2
-4*x = 3/2 // : -4
x = 3/2/(-4)
x = -3/8
x = -3/8
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