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t in (-oo:+oo)
(1/2)*t+(1/3)*t = 10 // - 10
(1/2)*t+(1/3)*t-10 = 0
5/6*t-10 = 0 // + 10
5/6*t = 10 // : 5/6
t = 10/5/6
t = 12
t = 12
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