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t in (-oo:+oo)
3-7*t = 62/9 // - 62/9
3-7*t-(62/9) = 0
3-7*t-62/9 = 0
-7*t-35/9 = 0 // + 35/9
-7*t = 35/9 // : -7
t = 35/9/(-7)
t = -5/9
t = -5/9
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