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t in (-oo:+oo)
-9 = (1/4)*t-7*t-9 // - (1/4)*t-7*t-9
9-(-7*t)-((1/4)*t)-9 = 0
7*t+(-1/4)*t-9+9 = 0
27/4*t = 0 // : 27/4
t = 0
t = 0
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