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t in (-oo:+oo)
7*t-8 = -25/4 // + -25/4
7*t-(-25/4)-8 = 0
7*t+25/4-8 = 0
7*t-7/4 = 0 // + 7/4
7*t = 7/4 // : 7
t = 7/4/7
t = 1/4
t = 1/4
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