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x in (-oo:+oo)
5/4 = x/3.25 // - x/3.25
5/4-(x/3.25) = 0
5/4-0.30769231*x = 0
5/4-0.30769231*x = 0 // - 5/4
-0.30769231*x = -5/4 // : -0.30769231
x = -5/4/(-0.30769231)
x = 4.06249997
x = 4.06249997
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