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X in (-oo:+oo)
(69-X)/0.34 = X // - X
(69-X)/0.34-X = 0
(69-X)/0.34+(0.34*(-X))/0.34 = 0
0.34*(-X)-X+69 = 0
69-1.34*X = 0
(69-1.34*X)/0.34 = 0
(69-1.34*X)/0.34 = 0 // * 0.34
69-1.34*X = 0
69-1.34*X = 0 // - 69
-1.34*X = -69 // : -1.34
X = -69/(-1.34)
X = 51.49253731
X = 51.49253731
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