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t in (-oo:+oo)
7*t-((2*(t-1))/7) = 8 // - 8
7*t-((2*(t-1))/7)-8 = 0
(-2/7)*(t-1)+7*t-8 = 0
7*t-2/7*(t-1)-8 = 0
7*t-2/7*(t-1)-8 = 0
47/7*t-8+2/7 = 0
47/7*t-54/7 = 0
47/7*t-54/7 = 0
47/7*t-54/7 = 0 // + 54/7
47/7*t = 54/7 // : 47/7
t = 54/7/47/7
t = 54/47
t = 54/47
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