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t in (-oo:+oo)
3*(5-(7*t)) = -216 // + 216
3*(5-(7*t))+216 = 0
3*(5-7*t)+216 = 0
3*(5-7*t)+216 = 0
231-21*t = 0
231-21*t = 0
231-21*t = 0 // - 231
-21*t = -231 // : -21
t = -231/(-21)
t = 11
t = 11
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