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x in (-oo:+oo)
x/13 = 109.2 // - 109.2
x/13-109.2 = 0
1/13*x-109.2 = 0 // + 109.2
1/13*x = 109.2 // : 1/13
x = 109.2/1/13
x = 1419.59994322
x = 1419.59994322
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