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x in (-oo:+oo)
6/4 = x/1.5 // - x/1.5
6/4-(x/1.5) = 0
6/4-0.66666667*x = 0
3/2-0.66666667*x = 0 // - 3/2
-0.66666667*x = -3/2 // : -0.66666667
x = -3/2/(-0.66666667)
x = 2.24999999
x = 2.24999999
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