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t in (-oo:+oo)
3*(10-4*t) = -78 // + 78
3*(10-4*t)+78 = 0
3*(10-4*t)+78 = 0
108-12*t = 0
108-12*t = 0
108-12*t = 0 // - 108
-12*t = -108 // : -12
t = -108/(-12)
t = 9
t = 9
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