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x in (-oo:+oo)
x/0.28 = 0.6/0.42 // - 0.6/0.42
x/0.28-(0.6/0.42) = 0
x/0.28-1.42857143 = 0
3.57142857*x-1.42857143 = 0 // + 1.42857143
3.57142857*x = 1.42857143 // : 3.57142857
x = 1.42857143/3.57142857
x = 0.4
x = 0.4
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