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t in (-oo:+oo)
-((2*t)/10)-4 = -12 // + 12
12-((2*t)/10)-4 = 0
(-1/5)*t-4+12 = 0
8-1/5*t = 0 // - 8
-1/5*t = -8 // : -1/5
t = -8/(-1/5)
t = 40
t = 40
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