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t in (-oo:+oo)
5*t+3/7 = -18/7 // + -18/7
5*t+3/7-(-18/7) = 0
5*t+3/7+18/7 = 0
5*t+3 = 0 // - 3
5*t = -3 // : 5
t = -3/5
t = -3/5
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