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t in (-oo:+oo)
t-((1/7)*t)-9 = -15/7 // + -15/7
t-((1/7)*t)-(-15/7)-9 = 0
t+(-1/7)*t+15/7-9 = 0
6/7*t-48/7 = 0 // + 48/7
6/7*t = 48/7 // : 6/7
t = 48/7/6/7
t = 8
t = 8
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