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t in (-oo:+oo)
(1/2)*(2*t-(3/4))+2/5 = (4/5)*t // - (4/5)*t
(1/2)*(2*t-(3/4))-((4/5)*t)+2/5 = 0
(1/2)*(2*t-3/4)+(-4/5)*t+2/5 = 0
1/2*(2*t-3/4)+(-4*t)/5+2/5 = 0
(1/2*5*(2*t-3/4))/5+(-4*t)/5+2/5 = 0
1/2*5*(2*t-3/4)-4*t+2 = 0
t-15/8+2 = 0
t+1/8 = 0
(t+1/8)/5 = 0
(t+1/8)/5 = 0 // * 5
t+1/8 = 0
t+1/8 = 0 // - 1/8
t = -1/8
t = -1/8
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