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t in (-oo:+oo)
7*(6*t+4) = -224 // + 224
7*(6*t+4)+224 = 0
7*(6*t+4)+224 = 0
42*t+252 = 0
42*t+252 = 0
42*t+252 = 0 // - 252
42*t = -252 // : 42
t = -252/42
t = -6
t = -6
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