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t in (-oo:+oo)
(1/3)*(24-(21*t)) = 0
(1/3)*(24-21*t) = 0
1/3*(24-21*t) = 0
( 1/3 )
1/3 = 0
t belongs to the empty set
( 24-21*t )
24-21*t = 0 // - 24
-21*t = -24 // : -21
t = -24/(-21)
t = 8/7
t = 8/7
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