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Y in (-oo:+oo)
Y/12-(6/7) = 13 // - 13
Y/12-(6/7)-13 = 0
Y/12-6/7-13 = 0
1/12*Y-97/7 = 0 // + 97/7
1/12*Y = 97/7 // : 1/12
Y = 97/7/1/12
Y = 1164/7
Y = 1164/7
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