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7log 4 × 2log 7 - 7log (49/25)log 4 / log 7 × log 7 / log 2 - 7log 49 - 7log 25
= log 2^2/log 7 × log 7/log 2 - 7log 7^2 - 7log 5^2
= 2.log 2/log 7 × log 7/log 2 -2.7log 7 - 2.7log 5
= 2 - 2 -2.7log 5
= -2.7log 5.