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Verified Answer :

1/3 9x = 3x

1/3
3 = 1

3x + 1 = 4x

3x + 1 = 4x

4x=4x

1/3(9x+3)=3x+1

3x+1=3x+1
     -1       -1

3x=3x

3x=3x
/3   /3

x=x