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t in (-oo:+oo)
-(5*t)-7 = -12 // + 12
12-(5*t)-7 = 0
12-5*t-7 = 0
5-5*t = 0 // - 5
-5*t = -5 // : -5
t = -5/(-5)
t = 1
t = 1
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