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t in (-oo:+oo)
3*(1-((1/5)*t)) = 0
3*((-1/5)*t+1) = 0
3*(1-1/5*t) = 0
( 1-1/5*t )
1-1/5*t = 0 // - 1
-1/5*t = -1 // : -1/5
t = -1/(-1/5)
t = 5
( 3 )
3 = 0
t belongs to the empty set
t = 5
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