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t in (-oo:+oo)
5*t-(5/(-10))+70 = 0
5*t+1/2+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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