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t in (-oo:+oo)
(3/5)*t+1/4 = -13/20 // + -13/20
(3/5)*t+1/4-(-13/20) = 0
(3/5)*t+1/4+13/20 = 0
3/5*t+9/10 = 0 // - 9/10
3/5*t = -9/10 // : 3/5
t = -9/10/3/5
t = -3/2
t = -3/2
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