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a in (-oo:+oo)
a/0.28 = 4/1.4 // - 4/1.4
a/0.28-(4/1.4) = 0
a/0.28-2.85714286 = 0
3.57142857*a-2.85714286 = 0 // + 2.85714286
3.57142857*a = 2.85714286 // : 3.57142857
a = 2.85714286/3.57142857
a = 0.8
a = 0.8
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