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t in (-oo:+oo)
2*t+3/7 = 4 // - 4
2*t+3/7-4 = 0
2*t-25/7 = 0 // + 25/7
2*t = 25/7 // : 2
t = 25/7/2
t = 25/14
t = 25/14
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