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t in (-oo:+oo)
t+7*t+1/2 = -21/22 // + -21/22
t+7*t+1/2-(-21/22) = 0
t+7*t+1/2+21/22 = 0
8*t+16/11 = 0 // - 16/11
8*t = -16/11 // : 8
t = -16/11/8
t = -2/11
t = -2/11
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