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t in (-oo:+oo)
-7 = 6*t-5*t-9 // - 6*t-5*t-9
9-(-5*t)-(6*t)-7 = 0
5*t-6*t-7+9 = 0
2-t = 0 // - 2
-t = -2 // * -1
t = 2
t = 2
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