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t in (-oo:+oo)
-7*t-1 = 2*t-91 // - 2*t-91
91-7*t-(2*t)-1 = 0
91-7*t-2*t-1 = 0
90-9*t = 0 // - 90
-9*t = -90 // : -9
t = -90/(-9)
t = 10
t = 10
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