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If 3x + 12 = 21, then x + 4 =

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by Jay@ManhattanReview » Sun Mar 10, 2019 8:47 pm
BTGmoderatorDC wrote:If 3x + 12 = 21, then x + 4 =

A. 3
B. 4
C. 5
D. 7
E. 9

OA D

Source: Princeton Review
We have 3x + 12 = 21

Takin 3 as common, we have 3(x + 4) = 21 => x + 4 = 21/3 = 7.

The correct answer: D

Hope this helps!

-Jay
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