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t in (-oo:+oo)
(1/2)*(8*t-18)+16 = 4*(t+3)-5 // - 4*(t+3)-5
(1/2)*(8*t-18)-(4*(t+3))+5+16 = 0
(1/2)*(8*t-18)-4*(t+3)+5+16 = 0
1/2*(8*t-18)-4*(t+3)+5+16 = 0
1/2*(8*t-18)-4*(t+3)+5+16 = 0
5-21+16 = 0
16-16 = 0
0 = 0
0 = 0
t belongs to the empty set
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