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t in (-oo:+oo)
(1/7)*t+9/2 = 9 // - 9
(1/7)*t+9/2-9 = 0
1/7*t-9/2 = 0 // + 9/2
1/7*t = 9/2 // : 1/7
t = 9/2/1/7
t = 63/2
t = 63/2
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