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