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t in (-oo:+oo)
-40 = 2*t+4*t+8 // - 2*t+4*t+8
-(2*t)-(4*t)-40-8 = 0
-2*t-4*t-40-8 = 0
-6*t-48 = 0 // + 48
-6*t = 48 // : -6
t = 48/(-6)
t = -8
t = -8
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