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t in (-oo:+oo)
-7*t-2 = -3*t-38 // + -3*t-38
38-7*t-(-3*t)-2 = 0
3*t-7*t-2+38 = 0
36-4*t = 0 // - 36
-4*t = -36 // : -4
t = -36/(-4)
t = 9
t = 9
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