Solve a=(d+pi*a/2)/-2

$$a = \frac{ (d+ \frac{ \pi \times a }{ 2 } ) }{ -2 }$$

Solve for a

$$a=-\frac{2d}{\pi +4}$$

Steps for Solving Linear Equation

Subtract \frac{d+\frac{\pi a}{2}}{-2} from both sides.

$$a-\frac{d+\frac{\pi a}{2}}{-2}=0$$

Multiply both sides of the equation by -2.

$$-2a-\left(d+\frac{\pi a}{2}\right)=0$$

Multiply both sides of the equation by 2.

$$-4a-2\left(d+\frac{\pi a}{2}\right)=0$$

Use the distributive property to multiply -2 by d+\frac{\pi a}{2}.

$$-4a-2d-2\times \frac{\pi a}{2}=0$$

Express -2\times \frac{\pi a}{2} as a single fraction.

$$-4a-2d+\frac{-2\pi a}{2}=0$$

Cancel out 2 and 2.

$$-4a-2d-\pi a=0$$

Add 2d to both sides. Anything plus zero gives itself.

$$-4a-\pi a=2d$$

Combine all terms containing a.

$$\left(-4-\pi \right)a=2d$$

The equation is in standard form.

$$\left(-\pi -4\right)a=2d$$

Divide both sides by -4-\pi .

$$\frac{\left(-\pi -4\right)a}{-\pi -4}=\frac{2d}{-\pi -4}$$

Dividing by -4-\pi undoes the multiplication by -4-\pi .

$$a=\frac{2d}{-\pi -4}$$

Divide 2d by -4-\pi .

$$a=-\frac{2d}{\pi +4}$$

Solve for d

$$d=-\frac{\left(\pi +4\right)a}{2}$$