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t in (-oo:+oo)
7*t+5 = 3*t-31 // - 3*t-31
7*t-(3*t)+5+31 = 0
7*t-3*t+5+31 = 0
4*t+36 = 0 // - 36
4*t = -36 // : 4
t = -36/4
t = -9
t = -9
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