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t in (-oo:+oo)
1-5*t = 7*t-83 // - 7*t-83
1-5*t-(7*t)+83 = 0
1-5*t-7*t+83 = 0
84-12*t = 0 // - 84
-12*t = -84 // : -12
t = -84/(-12)
t = 7
t = 7
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