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(3^x)^x=81
3^xx=81^4
x^2=4
x=2 atau x=-2
b.
1/64*4^x*2^x=64
1/2^6*(2^2)^x*2^x=2^6
1/2^6*2^3x=2^6
2^3x=2^12
3x=12
x=4