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t in (-oo:+oo)
-((1/4)*t) = 9 // - 9
-((1/4)*t)-9 = 0
(-1/4)*t-9 = 0
-1/4*t-9 = 0 // + 9
-1/4*t = 9 // : -1/4
t = 9/(-1/4)
t = -36
t = -36
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