Solve b+4/c+d=a

$$\frac { b + 4 } { c + d } = a$$

Solve for a

$$a=\frac{b+4}{c+d}$$

$$c\neq -d$$

Steps for Solving Linear Equation

Multiply both sides of the equation by c+d.

$$b+4=a\left(c+d\right)$$

Use the distributive property to multiply a by c+d.

$$b+4=ac+ad$$

Swap sides so that all variable terms are on the left hand side.

$$ac+ad=b+4$$

Combine all terms containing a.

$$\left(c+d\right)a=b+4$$

Divide both sides by c+d.

$$\frac{\left(c+d\right)a}{c+d}=\frac{b+4}{c+d}$$

Dividing by c+d undoes the multiplication by c+d.

$$a=\frac{b+4}{c+d}$$

Solve for b

$$b=ac+ad-4$$

$$c\neq -d$$