comparing both sides
3b=b+2
2b=2
b=1
and -6=a-8b
-6=a-8[b=1]
a=2
so, a-2b=2-2.1=2-2=0
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comparing both sides
3b=b+2
2b=2
b=1
and -6=a-8b
-6=a-8[b=1]
a=2
so, a-2b=2-2.1=2-2=0
a=2,b=1
a-2b
=2-2(1)
=2-2
=0