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t in (-oo:+oo)
6*(7*t+2) = 222 // - 222
6*(7*t+2)-222 = 0
6*(7*t+2)-222 = 0
42*t-210 = 0
42*t-210 = 0
42*t-210 = 0 // + 210
42*t = 210 // : 42
t = 210/42
t = 5
t = 5
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