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t in (-oo:+oo)
-38 = 2-2*t-(2*t) // - 2-2*t-(2*t)
2*t-(-2*t)-38-2 = 0
2*t+2*t-38-2 = 0
4*t-40 = 0 // + 40
4*t = 40 // : 4
t = 40/4
t = 10
t = 10
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