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Y in (-oo:+oo)
Y/7 = 3.5 // - 3.5
Y/7-3.5 = 0
1/7*Y-3.5 = 0 // + 3.5
1/7*Y = 3.5 // : 1/7
Y = 3.5/1/7
Y = 24.50000049
Y = 24.50000049
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