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t in (-oo:+oo)
t/8-(3/4) = 9/16 // - 9/16
t/8-(3/4)-(9/16) = 0
t/8-3/4-9/16 = 0
1/8*t-21/16 = 0 // + 21/16
1/8*t = 21/16 // : 1/8
t = 21/16/1/8
t = 21/2
t = 21/2
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