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t in (-oo:+oo)
t+(3/7)*t+7 = 52/7 // - 52/7
t+(3/7)*t-(52/7)+7 = 0
t+(3/7)*t-52/7+7 = 0
10/7*t-3/7 = 0 // + 3/7
10/7*t = 3/7 // : 10/7
t = 3/7/10/7
t = 3/10
t = 3/10
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