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x in (-oo:+oo)
x/0.22 = 0.5/0.7 // - 0.5/0.7
x/0.22-(0.5/0.7) = 0
x/0.22-0.71428571 = 0
4.54545455*x-0.71428571 = 0 // + 0.71428571
4.54545455*x = 0.71428571 // : 4.54545455
x = 0.71428571/4.54545455
x = 0.15714286
x = 0.15714286
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