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t in (-oo:+oo)
83 = 4*t+7*t+6 // - 4*t+7*t+6
83-(4*t)-(7*t)-6 = 0
83-4*t-7*t-6 = 0
77-11*t = 0 // - 77
-11*t = -77 // : -11
t = -77/(-11)
t = 7
t = 7
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