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t in (-oo:+oo)
3-(7*t) = 38 // - 38
3-(7*t)-38 = 0
3-7*t-38 = 0
-7*t-35 = 0 // + 35
-7*t = 35 // : -7
t = 35/(-7)
t = -5
t = -5
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