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Math (logarithmic functions)

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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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