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t in (-oo:+oo)
(-1/5)*t+1 = -4/5 // + -4/5
(-1/5)*t-(-4/5)+1 = 0
(-1/5)*t+4/5+1 = 0
9/5-1/5*t = 0 // - 9/5
-1/5*t = -9/5 // : -1/5
t = -9/5/(-1/5)
t = 9
t = 9
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