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t in (-oo:+oo)
-2 = t/20+8 // - t/20+8
-(t/20)-8-2 = 0
-1/20*t-10 = 0 // + 10
-1/20*t = 10 // : -1/20
t = 10/(-1/20)
t = -200
t = -200
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