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t in (-oo:+oo)
(1/5)*t+(1/7)*t+22/35-(8/7) = 6/35 // - 6/35
(1/5)*t+(1/7)*t+22/35-(8/7)-(6/35) = 0
(1/5)*t+(1/7)*t+22/35-8/7-6/35 = 0
12/35*t-24/35 = 0 // + 24/35
12/35*t = 24/35 // : 12/35
t = 24/35/12/35
t = 2
t = 2
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