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t in (-oo:+oo)
t/3+2 = 4-((6/7)*t) // - 4-((6/7)*t)
t/3+(6/7)*t-4+2 = 0
25/21*t-2 = 0 // + 2
25/21*t = 2 // : 25/21
t = 2/25/21
t = 42/25
t = 42/25
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