Solve 9-2x=4r

$$9 - 2 x = 4 r$$

Solve for r

$$r=-\frac{x}{2}+\frac{9}{4}$$

Steps for Solving Linear Equation

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

$$4r=9-2x$$

Divide both sides by 4.

$$\frac{4r}{4}=\frac{9-2x}{4}$$

Dividing by 4 undoes the multiplication by 4.

$$r=\frac{9-2x}{4}$$

Divide 9-2x by 4.

$$r=-\frac{x}{2}+\frac{9}{4}$$

Solve for x

$$x=\frac{9}{2}-2r$$

Steps for Solving Linear Equation

Subtract 9 from both sides.

$$-2x=4r-9$$

Divide both sides by -2.

$$\frac{-2x}{-2}=\frac{4r-9}{-2}$$

Dividing by -2 undoes the multiplication by -2.

$$x=\frac{4r-9}{-2}$$

Divide 4r-9 by -2.

$$x=\frac{9}{2}-2r$$