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x in (-oo:+oo)
x-(x/10.3) = 420 // - 420
x-(x/10.3)-420 = 0
x-0.09708738*x-420 = 0
0.90291262*x-420 = 0 // + 420
0.90291262*x = 420 // : 0.90291262
x = 420/0.90291262
x = 465.16129102
x = 465.16129102
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