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t in (-oo:+oo)
10-((4*t)/8) = 12 // - 12
10-((4*t)/8)-12 = 0
(-1/2)*t-12+10 = 0
-1/2*t-2 = 0 // + 2
-1/2*t = 2 // : -1/2
t = 2/(-1/2)
t = -4
t = -4
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