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t in (-oo:+oo)
7*t-9 = -7*t-93 // + -7*t-93
7*t-(-7*t)-9+93 = 0
7*t+7*t-9+93 = 0
14*t+84 = 0 // - 84
14*t = -84 // : 14
t = -84/14
t = -6
t = -6
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