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t in (-oo:+oo)
2-7*t-(2*t) = -70 // + 70
2-7*t-(2*t)+70 = 0
2-7*t-2*t+70 = 0
72-9*t = 0 // - 72
-9*t = -72 // : -9
t = -72/(-9)
t = 8
t = 8
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