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t in (-oo:+oo)
t/9 = 4.2/3 // - 4.2/3
t/9-(4.2/3) = 0
t/9-1.4 = 0
1/9*t-1.4 = 0 // + 1.4
1/9*t = 1.4 // : 1/9
t = 1.4/1/9
t = 12.60000013
t = 12.60000013
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