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t in (-oo:+oo)
-((4*t)/5)-5 = -12 // + 12
12-((4*t)/5)-5 = 0
(-4/5)*t-5+12 = 0
7-4/5*t = 0 // - 7
-4/5*t = -7 // : -4/5
t = -7/(-4/5)
t = 35/4
t = 35/4
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