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10 pangkat 2x-1=10pangkat -3
2x -1=-3 (10 di hilangkan)
2x= -3+1
2x= -2
x= -1
10^2x-1=1/1000
10^2x.10^-1=1/1000
10^2^x=1/1000x10
100^x=1/100
x=-1