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T in (-oo:+oo)
T/(-4) = 2.1 // - 2.1
T/(-4)-2.1 = 0
-1/4*T-2.1 = 0 // + 2.1
-1/4*T = 2.1 // : -1/4
T = 2.1/(-1/4)
T = -8.4
T = -8.4
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