Answer:
D. 13
Step-by-step explanation:
Multiply the given equation by 39x/27:
... x = 9·39/27 = 39/3
... x = 13
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The usual approach
You may have learned to "cross multiply" to eliminate fractions. That means you multiply by the product of the denominators, 39x:
... 9·39 = 27x
Now, you divide by the coefficient of x, which is 27.
... 9/27 · 39 = x = 39/3 = 13 . . . . . . in the end, the same as above
