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Y in (-oo:+oo)
Y/12 = 2.89/4.23 // - 2.89/4.23
Y/12-(2.89/4.23) = 0
Y/12-0.68321513 = 0
1/12*Y-0.68321513 = 0 // + 0.68321513
1/12*Y = 0.68321513 // : 1/12
Y = 0.68321513/1/12
Y = 8.19858189
Y = 8.19858189
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