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t in (-oo:+oo)
(1/4)*(4+8) = t+8/8 // - t+8/8
(1/4)*(4+8)-t-(8/8) = 0
(1/4)*(4+8)-t-1 = 0
2-t = 0 // - 2
-t = -2 // * -1
t = 2
t = 2
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