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Y in (-oo:+oo)
Y/7 = 45/21 // - 45/21
Y/7-(45/21) = 0
Y/7-15/7 = 0
1/7*Y-15/7 = 0 // + 15/7
1/7*Y = 15/7 // : 1/7
Y = 15/7/1/7
Y = 15
Y = 15
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