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7. (3+4)(3^2+4^2)(3^4+4^4)(3^8+4^8)(3^16+4^16)(3^32+4^32)=4^x-3^y
x = y = 2 ^ (suku yg memiliki pangkat yg berkelipatan) = 2^6( karena dari 1.2.4.8.16.32)= 64
sehingga x-y= 64-64=0