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t in (-oo:+oo)
1/2-7*t = 15/2 // - 15/2
1/2-7*t-(15/2) = 0
1/2-7*t-15/2 = 0
-7*t-7 = 0 // + 7
-7*t = 7 // : -7
t = 7/(-7)
t = -1
t = -1
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