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x in (-oo:+oo)
2/6 = x/3.5 // - x/3.5
2/6-(x/3.5) = 0
2/6-0.28571429*x = 0
1/3-0.28571429*x = 0 // - 1/3
-0.28571429*x = -1/3 // : -0.28571429
x = -1/3/(-0.28571429)
x = 1.16666664
x = 1.16666664
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