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x in (-oo:+oo)
1.9/6 = x/4 // - x/4
1.9/6-(x/4) = 0
0.31666667-1/4*x = 0 // - 0.31666667
-1/4*x = -0.31666667 // : -1/4
x = -0.31666667/(-1/4)
x = 1.26666668
x = 1.26666668
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