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x in (-oo:+oo)
2/5 = x/17.5 // - x/17.5
2/5-(x/17.5) = 0
2/5-0.05714286*x = 0
2/5-0.05714286*x = 0 // - 2/5
-0.05714286*x = -2/5 // : -0.05714286
x = -2/5/(-0.05714286)
x = 6.99999965
x = 6.99999965
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