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t in (-oo:+oo)
8-5*t = -2*t-4 // + -2*t-4
4-5*t-(-2*t)+8 = 0
2*t-5*t+4+8 = 0
12-3*t = 0 // - 12
-3*t = -12 // : -3
t = -12/(-3)
t = 4
t = 4
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