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x in (-oo:+oo)
4.75/6 = x/4 // - x/4
4.75/6-(x/4) = 0
0.79166667-1/4*x = 0 // - 0.79166667
-1/4*x = -0.79166667 // : -1/4
x = -0.79166667/(-1/4)
x = 3.16666668
x = 3.16666668
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