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t in (-oo:+oo)
-7*t-10 = 6*t-166 // - 6*t-166
166-7*t-(6*t)-10 = 0
166-7*t-6*t-10 = 0
156-13*t = 0 // - 156
-13*t = -156 // : -13
t = -156/(-13)
t = 12
t = 12
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