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x in (-oo:+oo)
x/0.14 = 570 // - 570
x/0.14-570 = 0
7.14285714*x-570 = 0 // + 570
7.14285714*x = 570 // : 7.14285714
x = 570/7.14285714
x = 79.80000003
x = 79.80000003
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