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t in (-oo:+oo)
4*(7*t+2) = -20 // + 20
4*(7*t+2)+20 = 0
4*(7*t+2)+20 = 0
28*t+28 = 0
28*t+28 = 0
28*t+28 = 0 // - 28
28*t = -28 // : 28
t = -28/28
t = -1
t = -1
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