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t in (-oo:+oo)
5*t+5/(-10) = 70 // - 70
5*t+5/(-10)-70 = 0
5*t-141/2 = 0 // + 141/2
5*t = 141/2 // : 5
t = 141/2/5
t = 141/10
t = 141/10
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