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x in (-oo:+oo)
60*(x/2.2) = 39 // - 39
60*(x/2.2)-39 = 0
27.272727*x-39 = 0 // + 39
27.272727*x = 39 // : 27.272727
x = 39/27.272727
x = 1.43000001
x = 1.43000001
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