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X in (-oo:+oo)
(X-19.6)/5 = 9.8 // - 9.8
(X-19.6)/5-9.8 = 0
(X-19.6)/5+(-9.8*5)/5 = 0
X-9.8*5-19.6 = 0
X-68.6 = 0
(X-68.6)/5 = 0
(X-68.6)/5 = 0 // * 5
X-68.6 = 0
X-68.6 = 0 // + 68.6
X = 68.6
X = 68.6
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