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t in (-oo:+oo)
(1/2)*t-((2/5)*t) = (1/10)*t-1 // - (1/10)*t-1
(1/2)*t-((2/5)*t)-((1/10)*t)+1 = 0
(1/2)*t+(-2/5)*t+(-1/10)*t+1 = 0
1 = 0
t belongs to the empty set
t belongs to the empty set
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