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x in (-oo:+oo)
x/8.1 = 2/2.8 // - 2/2.8
x/8.1-(2/2.8) = 0
x/8.1-0.71428571 = 0
0.12345679*x-0.71428571 = 0 // + 0.71428571
0.12345679*x = 0.71428571 // : 0.12345679
x = 0.71428571/0.12345679
x = 5.78571426
x = 5.78571426
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