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