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t in (-oo:+oo)
(-4/7)*t-4 = 8 // - 8
(-4/7)*t-8-4 = 0
-4/7*t-12 = 0 // + 12
-4/7*t = 12 // : -4/7
t = 12/(-4/7)
t = -21
t = -21
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