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x in (-oo:+oo)
4.25/6 = x/4 // - x/4
4.25/6-(x/4) = 0
0.70833333-1/4*x = 0 // - 0.70833333
-1/4*x = -0.70833333 // : -1/4
x = -0.70833333/(-1/4)
x = 2.83333332
x = 2.83333332
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