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t in (-oo:+oo)
5*t = -20/11 // + -20/11
5*t-(-20/11) = 0
5*t+20/11 = 0
5*t+20/11 = 0 // - 20/11
5*t = -20/11 // : 5
t = -20/11/5
t = -4/11
t = -4/11
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