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t in (-oo:+oo)
-((3/7)*t)-((4/7)*t)-1/5 = -17/35 // + -17/35
-((3/7)*t)-((4/7)*t)-1/5-(-17/35) = 0
(-3/7)*t+(-4/7)*t-1/5+17/35 = 0
2/7-t = 0 // - 2/7
-t = -2/7 // * -1
t = 2/7
t = 2/7
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