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