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t in (-oo:+oo)
5-3*t = 71/10 // - 71/10
5-3*t-(71/10) = 0
5-3*t-71/10 = 0
-3*t-21/10 = 0 // + 21/10
-3*t = 21/10 // : -3
t = 21/10/(-3)
t = -7/10
t = -7/10
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