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x in (-oo:+oo)
-4*x = 17/10-(20/10) // - 17/10-(20/10)
20/10-4*x-(17/10) = 0
20/10-4*x-17/10 = 0
3/10-4*x = 0 // - 3/10
-4*x = -3/10 // : -4
x = -3/10/(-4)
x = 3/40
x = 3/40
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