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t in (-oo:+oo)
3*(20-(12*t)) = (8/7)*(21*t+14)-12 // - (8/7)*(21*t+14)-12
3*(20-(12*t))-((8/7)*(21*t+14))+12 = 0
3*(20-12*t)+(-8/7)*(21*t+14)+12 = 0
3*(20-12*t)-8/7*(21*t+14)+12 = 0
3*(20-12*t)-8/7*(21*t+14)+12 = 0
12-60*t+44 = 0
56-60*t = 0
56-60*t = 0
56-60*t = 0 // - 56
-60*t = -56 // : -60
t = -56/(-60)
t = 14/15
t = 14/15
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