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t in (-oo:+oo)
76 = 6*t+3*t+4 // - 6*t+3*t+4
76-(6*t)-(3*t)-4 = 0
76-6*t-3*t-4 = 0
72-9*t = 0 // - 72
-9*t = -72 // : -9
t = -72/(-9)
t = 8
t = 8
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