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t in (-oo:+oo)
2*(-(t/5)-1/2) = (38*t)/5-8 // - (38*t)/5-8
2*(-(t/5)-1/2)-((38*t)/5)+8 = 0
2*(-(t/5)-1/2)+(-38/5)*t+8 = 0
2*(-1/5*t-1/2)+(-38*t)/5+8 = 0
(2*5*(-1/5*t-1/2))/5+(-38*t)/5+(5*8)/5 = 0
2*5*(-1/5*t-1/2)-38*t+5*8 = 0
40-40*t-5 = 0
35-40*t = 0
(35-40*t)/5 = 0
(35-40*t)/5 = 0 // * 5
35-40*t = 0
35-40*t = 0 // - 35
-40*t = -35 // : -40
t = -35/(-40)
t = 7/8
t = 7/8
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