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t in (-oo:+oo)
2*(7*t+1) = 100 // - 100
2*(7*t+1)-100 = 0
2*(7*t+1)-100 = 0
14*t-98 = 0
14*t-98 = 0
14*t-98 = 0 // + 98
14*t = 98 // : 14
t = 98/14
t = 7
t = 7
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