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t in (-oo:+oo)
(1/3)*(t-7) = -7 // + 7
(1/3)*(t-7)+7 = 0
1/3*(t-7)+7 = 0
1/3*(t-7)+7 = 0
1/3*t+14/3 = 0
1/3*t+14/3 = 0
1/3*t+14/3 = 0 // - 14/3
1/3*t = -14/3 // : 1/3
t = -14/3/1/3
t = -14
t = -14
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