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t in (-oo:+oo)
6*t+(2/6)*t-7 = 2*t+(6/2)*t-7 // - 2*t+(6/2)*t-7
6*t+(2/6)*t-(2*t)-((6/2)*t)-7+7 = 0
6*t+(2/6)*t-2*t-3*t-7+7 = 0
4/3*t = 0 // : 4/3
t = 0
t = 0
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