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2^(2x +2) + 2^2x =20
2^2x .2² + 2^2x =20
5. 2^2x =20
2^2x =4
2^2x = 2²
maka 2x =2 ---> x=1
4x + 1 + 4 + 2x = 20
4x + 2x = 20 - 4 - 1
6x = 15
x = 15/6
= 2,5 (maaf kalo salah)