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x in (-oo:+oo)
4/7.00000014 = x/5 // - x/5
4/7.00000014-(x/5) = 0
0.57142856-1/5*x = 0 // - 0.57142856
-1/5*x = -0.57142856 // : -1/5
x = -0.57142856/(-1/5)
x = 2.8571428
x = 2.8571428
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