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t in (-oo:+oo)
(1/7)*(t-2) = -3 // + 3
(1/7)*(t-2)+3 = 0
1/7*(t-2)+3 = 0
1/7*(t-2)+3 = 0
1/7*t+19/7 = 0
1/7*t+19/7 = 0
1/7*t+19/7 = 0 // - 19/7
1/7*t = -19/7 // : 1/7
t = -19/7/1/7
t = -19
t = -19
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