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t in (-oo:+oo)
t+(4/5)*t+8 = 65/7 // - 65/7
t+(4/5)*t-(65/7)+8 = 0
t+(4/5)*t-65/7+8 = 0
9/5*t-9/7 = 0 // + 9/7
9/5*t = 9/7 // : 9/5
t = 9/7/9/5
t = 5/7
t = 5/7
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