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t in (-oo:+oo)
(t+5)/2 = (7*t-5)/14 // - (7*t-5)/14
(t+5)/2-((7*t-5)/14) = 0
(t+5)/2+(-1*(7*t-5))/14 = 0
(14*(t+5))/(2*14)+(-1*2*(7*t-5))/(2*14) = 0
14*(t+5)-1*2*(7*t-5) = 0
80 = 0
80/(2*14) = 0
80/(2*14) = 0 // * 2*14
80 = 0
t belongs to the empty set
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