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t in (-oo:+oo)
-7*t-7 = -105/8 // + -105/8
-7*t-(-105/8)-7 = 0
105/8-7*t-7 = 0
49/8-7*t = 0 // - 49/8
-7*t = -49/8 // : -7
t = -49/8/(-7)
t = 7/8
t = 7/8
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