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t in (-oo:+oo)
8.7 = (19.8-(4*t))/3 // - (19.8-(4*t))/3
8.7-((19.8-(4*t))/3) = 0
8.7-((19.8-4*t)/3) = 0
(-1*(19.8-4*t))/3+8.7 = 0
(-1*(19.8-4*t))/3+(3*8.7)/3 = 0
3*8.7-1*(19.8-4*t) = 0
4*t+6.3 = 0
(4*t+6.3)/3 = 0
(4*t+6.3)/3 = 0 // * 3
4*t+6.3 = 0
4*t+6.3 = 0 // - 6.3
4*t = -6.3 // : 4
t = -6.3/4
t = -1.575
t = -1.575
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