Posted by **Ralph** on Wednesday, April 6, 2011 at 8:52pm.

Those are the only ones I can't seem to resolve. Thank you!

resolve x:

1) 9*3^0,51x = 315

2) 10*3^15x+21 =363*2^9x+51

3) log(15x^2) - log(3x) = 4*log(3)

4) log[of base 3]*(15x + 4) = 3

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