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t in (-oo:+oo)
(1/2)*(t+9) = 43 // - 43
(1/2)*(t+9)-43 = 0
1/2*(t+9)-43 = 0
1/2*(t+9)-43 = 0
1/2*t-77/2 = 0
1/2*t-77/2 = 0
1/2*t-77/2 = 0 // + 77/2
1/2*t = 77/2 // : 1/2
t = 77/2/1/2
t = 77
t = 77
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