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