54
35
1
23
Correct answer is A
8x÷(14)y=1
(23)x÷(2−2)y=20
23x−(−2y)=20
⟹3x+2y=0....(1)
log2(x−2y)=1
x−2y=21=2.....(2)
Solving equations 1 and 2,
x=12,y=−34
(x−y)=12−−34=54
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