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t in (-oo:+oo)
23 = t-4*t+2 // - t-4*t+2
23-(-4*t)-t-2 = 0
4*t-t-2+23 = 0
3*t+21 = 0 // - 21
3*t = -21 // : 3
t = -21/3
t = -7
t = -7
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