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t in (-oo:+oo)
9-4*t = 2*t+63 // - 2*t+63
9-4*t-(2*t)-63 = 0
9-4*t-2*t-63 = 0
-6*t-54 = 0 // + 54
-6*t = 54 // : -6
t = 54/(-6)
t = -9
t = -9
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