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(2^2)^x+2=^3√(2^4)^x+5
~ 2x+4=(4x+20)/3
3(2x+4)=4x+20
6x+12=4x+20
6x-4x=20-12
2x=8
x=4
jadi 2^x-1=2^4-1=2^3=8