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x in (-oo:+oo)
1.3/4 = x/9 // - x/9
1.3/4-(x/9) = 0
0.325-1/9*x = 0 // - 0.325
-1/9*x = -0.325 // : -1/9
x = -0.325/(-1/9)
x = 2.92500003
x = 2.92500003
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