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t in (-oo:+oo)
(1/4)*t+13/7 = 3 // - 3
(1/4)*t+13/7-3 = 0
1/4*t-8/7 = 0 // + 8/7
1/4*t = 8/7 // : 1/4
t = 8/7/1/4
t = 32/7
t = 32/7
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