[tex]\frac{4d+2}{4}=2d+1[/tex]
First, divide the left side:
[tex]d+\frac{1}{2}=2d+1[/tex]
Move the "d" terms to the left side of the equation:
[tex]d-2d=1-\frac{1}{2}[/tex][tex]-d=\frac{1}{2}[/tex]
Multiply both sides of the equation by -1.
[tex]-d(-1)=\frac{1}{2}(-1)[/tex][tex]d=-\frac{1}{2}[/tex]
Correct option: a
