Answer :

First we need to group like terms:
[tex]x- \frac{2}{7} =3[/tex]

We do this by adding [tex]\frac{2}{7}[/tex] to both sides:
[tex]x=3 \frac{2}{7}[/tex]
apologiabiology
first, we get the placeholders on one side
x-2/7=3
add 2/7 to both sides
x=3+2/7
   3=21/7
x=21/7+2/7
x=23/7
x=3 and 2/7
so the answer is D

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