Hi experts ..this is eg 8 with book's solution as well as fine .but My final ans is not coming same ..Pls tell where is MY MISTAKE ..( pls tell my mistake and explain it ..do not need to explain whole question)

Dear Student, 
Solution) The last second step should be as follows 
    2×(2×33)+4624=123+4624=433+624=33+66
or=336+66=32+66×66=32+16
Regards!

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