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t in (-oo:+oo)
(1/2)*t+8 = (5/2)*t-10 // - (5/2)*t-10
(1/2)*t-((5/2)*t)+8+10 = 0
(1/2)*t+(-5/2)*t+8+10 = 0
18-2*t = 0 // - 18
-2*t = -18 // : -2
t = -18/(-2)
t = 9
t = 9
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