To answer it needs to be confirmed if the value X+3 is completely in dividend of 7. If so then Meg ans is correct i.e. 18, if not then Wayne Z is correct with -1/3.
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Use cross-multiplication.
For example: a/b = c/d would cross multiply out to ad = bc
In this case, that means 6(x+3) = 7x which is the same as 6x + 18 = 7x, or x =18
