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t in (-oo:+oo)
t/3 = -3/7 // + -3/7
t/3-(-3/7) = 0
t/3+3/7 = 0
1/3*t+3/7 = 0 // - 3/7
1/3*t = -3/7 // : 1/3
t = -3/7/1/3
t = -9/7
t = -9/7
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