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t in (-oo:+oo)
2*t+7 = 67/11 // - 67/11
2*t-(67/11)+7 = 0
2*t-67/11+7 = 0
2*t+10/11 = 0 // - 10/11
2*t = -10/11 // : 2
t = -10/11/2
t = -5/11
t = -5/11
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