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t in (-oo:+oo)
2*t-(3/10) = 11/30 // - 11/30
2*t-(3/10)-(11/30) = 0
2*t-3/10-11/30 = 0
2*t-2/3 = 0 // + 2/3
2*t = 2/3 // : 2
t = 2/3/2
t = 1/3
t = 1/3
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