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X in (-oo:+oo)
25/8 = X/6.5 // - X/6.5
25/8-(X/6.5) = 0
25/8-0.15384615*X = 0
25/8-0.15384615*X = 0 // - 25/8
-0.15384615*X = -25/8 // : -0.15384615
X = -25/8/(-0.15384615)
X = 20.31250051
X = 20.31250051
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