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t in (-oo:+oo)
(5*t-5)/(-10) = 70 // - 70
(5*t-5)/(-10)-70 = 0
(5*t-5)/(-10)+(-70*(-10))/(-10) = 0
5*t-70*(-10)-5 = 0
5*t+695 = 0
(5*t+695)/(-10) = 0
(5*t+695)/(-10) = 0 // * -10
5*t+695 = 0
5*t+695 = 0 // - 695
5*t = -695 // : 5
t = -695/5
t = -139
t = -139
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