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y in (-oo:+oo)
y/17.5 = 7 // - 7
y/17.5-7 = 0
0.05714286*y-7 = 0 // + 7
0.05714286*y = 7 // : 0.05714286
y = 7/0.05714286
y = 122.49999388
y = 122.49999388
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