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t in (-oo:+oo)
7*t = -28/5 // + -28/5
7*t-(-28/5) = 0
7*t+28/5 = 0
7*t+28/5 = 0 // - 28/5
7*t = -28/5 // : 7
t = -28/5/7
t = -4/5
t = -4/5
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