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t in (-oo:+oo)
2*(7*t-5) = 102 // - 102
2*(7*t-5)-102 = 0
2*(7*t-5)-102 = 0
14*t-112 = 0
14*t-112 = 0
14*t-112 = 0 // + 112
14*t = 112 // : 14
t = 112/14
t = 8
t = 8
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