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