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2. e (2log48)
3. a (a+b+c)
4. c (2) log (x+1) - log (x-1) = log3
log [(x+1) / (x-1)] = log3
[(x+1) / (x-1)]= 3
x+1 = 3 (x-1)
x+1 = 3x-3
2x = 4
x=2