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t in (-oo:+oo)
3-2*t = 4*t-63 // - 4*t-63
3-2*t-(4*t)+63 = 0
3-2*t-4*t+63 = 0
66-6*t = 0 // - 66
-6*t = -66 // : -6
t = -66/(-6)
t = 11
t = 11
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