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t in (-oo:+oo)
2-(7*t) = 2*t-7 // - 2*t-7
2-(7*t)-(2*t)+7 = 0
2-7*t-2*t+7 = 0
9-9*t = 0 // - 9
-9*t = -9 // : -9
t = -9/(-9)
t = 1
t = 1
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