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t in (-oo:+oo)
2*t-4 = 4*t+18 // - 4*t+18
2*t-(4*t)-18-4 = 0
2*t-4*t-18-4 = 0
-2*t-22 = 0 // + 22
-2*t = 22 // : -2
t = 22/(-2)
t = -11
t = -11
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