1
12
-1
Correct answer is B
27x×31−x92x=1
33x×31−x32(2−x)=30
33x×31−x÷34x=30
3(3x+1−x−4x)=30
3(1−2x)=30
since the bases are equal,
1 - 2x = 0
- 2x = -1
x = 12
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