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If la-5l + LB + 6L = 0, find the value of - B-A - (- 2 / 3)
La-5l + LB + 6L = 0
A-5 = 0, B + 6 = 0, so a = 5, B = - 6
-（-6）- 5-(-2/3)=5/3
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