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t in (-oo:+oo)
t+2/3 = (-6/7)*t+148/105 // - (-6/7)*t+148/105
t-((-6/7)*t)+2/3-(148/105) = 0
t+(6/7)*t+2/3-148/105 = 0
13/7*t-26/35 = 0 // + 26/35
13/7*t = 26/35 // : 13/7
t = 26/35/13/7
t = 2/5
t = 2/5
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