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t in (-oo:+oo)
2*(7*t+9) = -66 // + 66
2*(7*t+9)+66 = 0
2*(7*t+9)+66 = 0
14*t+84 = 0
14*t+84 = 0
14*t+84 = 0 // - 84
14*t = -84 // : 14
t = -84/14
t = -6
t = -6
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