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t in (-oo:+oo)
7*(4*t+4) = -280 // + 280
7*(4*t+4)+280 = 0
7*(4*t+4)+280 = 0
28*t+308 = 0
28*t+308 = 0
28*t+308 = 0 // - 308
28*t = -308 // : 28
t = -308/28
t = -11
t = -11
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