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t in (-oo:+oo)
1/2-4*t = 65/2 // - 65/2
1/2-4*t-(65/2) = 0
1/2-4*t-65/2 = 0
-4*t-32 = 0 // + 32
-4*t = 32 // : -4
t = 32/(-4)
t = -8
t = -8
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