If x = 1 + log 2 - log 5, y = 2 log 3 and z = log a - log 5; find the value of a, if x + y = 2z.
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If x = log 0.6; y = log 1.25 and z = log 3 - 2 log 2, find the values of :
(i) x + y - z
(ii) 5x + y - z
If a2 = log x, b3 = log y and 3a2 - 2b3 = 6 log z, express y in terms of x and z.