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²log 64 = ² log 2.4.4.2 = ²log 2 + ²log 4+ ²log 4 + ²log 2
= x + y + y + x
= 2x + 2y
2. ³log (x+5) = 2 -> 3² = (x+5)
9 = x + 5
9 - 5 = x
4 = x