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t in (-oo:+oo)
12-((2/5)*t) = 5 // - 5
12-((2/5)*t)-5 = 0
(-2/5)*t-5+12 = 0
7-2/5*t = 0 // - 7
-2/5*t = -7 // : -2/5
t = -7/(-2/5)
t = 35/2
t = 35/2
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