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t in (-oo:+oo)
(1/7)*t+(3/5)*t+4/7 = 332/35 // - 332/35
(1/7)*t+(3/5)*t+4/7-(332/35) = 0
(1/7)*t+(3/5)*t+4/7-332/35 = 0
26/35*t-312/35 = 0 // + 312/35
26/35*t = 312/35 // : 26/35
t = 312/35/26/35
t = 12
t = 12
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