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t in (-oo:+oo)
(1/9)*t+7/2 = 8 // - 8
(1/9)*t+7/2-8 = 0
1/9*t-9/2 = 0 // + 9/2
1/9*t = 9/2 // : 1/9
t = 9/2/1/9
t = 81/2
t = 81/2
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