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t in (-oo:+oo)
(1/8)*(t-7) = -3 // + 3
(1/8)*(t-7)+3 = 0
1/8*(t-7)+3 = 0
1/8*(t-7)+3 = 0
1/8*t+17/8 = 0
1/8*t+17/8 = 0
1/8*t+17/8 = 0 // - 17/8
1/8*t = -17/8 // : 1/8
t = -17/8/1/8
t = -17
t = -17
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