trial and error method of a-2=6
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a-2=6
put a =1
1-2=-1
LHS≠ RHS
a=2
2-2=0
LHS≠ RHS
a=3
3-2=1
LHS≠ RHS
similarly a=8
8-2=6
here
LHS=RHS
put a =1
1-2=-1
LHS≠ RHS
a=2
2-2=0
LHS≠ RHS
a=3
3-2=1
LHS≠ RHS
similarly a=8
8-2=6
here
LHS=RHS
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