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a in (-oo:+oo)
6/5 = a/17.5 // - a/17.5
6/5-(a/17.5) = 0
6/5-0.05714286*a = 0
6/5-0.05714286*a = 0 // - 6/5
-0.05714286*a = -6/5 // : -0.05714286
a = -6/5/(-0.05714286)
a = 20.99999895
a = 20.99999895
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