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t in (-oo:+oo)
3-(7*t)-(3*t) = -107 // + 107
3-(7*t)-(3*t)+107 = 0
3-7*t-3*t+107 = 0
110-10*t = 0 // - 110
-10*t = -110 // : -10
t = -110/(-10)
t = 11
t = 11
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