If log(2a×3b×5c)log(2^{a}\times3^{b}\times5^{c} )log(2a×3b×5c)is the arithmetic mean of log(22×33×5)log ( 2^{2}\times3^{3}\times5)log(22×33×5), log(26×3×57)log(2^{6}\times3\times5^{7} )log(26×3×57), and log(2×32×54)log(2 \times3^{2}\times5^{4} )log(2×32×54), then a equals
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