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t in (-oo:+oo)
0 = t-4*t-3 // - t-4*t-3
0-(-4*t)-t+3 = 0
4*t-t+0+3 = 0
3*t+3 = 0 // - 3
3*t = -3 // : 3
t = -3/3
t = -1
t = -1
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