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2^2. 2^p + 2^4. 2^p + 2^6. 2^p = 21 (64)
2^p( 2^2 + 2^4 +2^6) = 21(64)
2^p( 4+16+64) = 21(64)
2^p (84) = 21(64)
2^p = 21(64)/(84)= 16= 2^4
p= 4