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X in (-oo:+oo)
4.5 = ((1/2)*X)/9.8 // - ((1/2)*X)/9.8
4.5-(((1/2)*X)/9.8) = 0
4.5-0.05102041*X = 0
4.5-0.05102041*X = 0 // - 4.5
-0.05102041*X = -4.5 // : -0.05102041
X = -4.5/(-0.05102041)
X = 88.19999682
X = 88.19999682
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