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x in (-oo:+oo)
x = 30*t-32*(1/2)*t*t // - 30*t-32*(1/2)*t*t
x-(-32*(1/2)*t*t)-(30*t) = 0
16*t^2-30*t+x = 0
16*t^2-30*t+x = 0 // - 16*t^2-30*t
x = -(16*t^2-30*t)
x = -(16*t^2-30*t)
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