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t in (-oo:+oo)
7*(2*t-7) = -77 // + 77
7*(2*t-7)+77 = 0
7*(2*t-7)+77 = 0
14*t+28 = 0
14*t+28 = 0
14*t+28 = 0 // - 28
14*t = -28 // : 14
t = -28/14
t = -2
t = -2
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