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t in (-oo:+oo)
7*(2*t+10) = 196 // - 196
7*(2*t+10)-196 = 0
7*(2*t+10)-196 = 0
14*t-126 = 0
14*t-126 = 0
14*t-126 = 0 // + 126
14*t = 126 // : 14
t = 126/14
t = 9
t = 9
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