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x in (-oo:+oo)
x/12.2 = 13 // - 13
x/12.2-13 = 0
0.08196721*x-13 = 0 // + 13
0.08196721*x = 13 // : 0.08196721
x = 13/0.08196721
x = 158.60000603
x = 158.60000603
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