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t in (-oo:+oo)
9-t = 31-3*t // - 31-3*t
9-t-(-3*t)-31 = 0
3*t-t-31+9 = 0
2*t-22 = 0 // + 22
2*t = 22 // : 2
t = 22/2
t = 11
t = 11
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