Solve (x10)*20-x=640

$$(x10) \times 20-x=640$$

Solve for x

$$x=20\left(x_{10}-32\right)$$

Steps for Solving Linear Equation

Subtract x_{10}\times 20 from both sides.

$$-x=640-x_{10}\times 20$$

Multiply -1 and 20 to get -20.

$$-x=640-20x_{10}$$

Divide both sides by -1.

$$\frac{-x}{-1}=\frac{640-20x_{10}}{-1}$$

Dividing by -1 undoes the multiplication by -1.

$$x=\frac{640-20x_{10}}{-1}$$

Divide 640-20x_{10} by -1.

$$x=20x_{10}-640$$

Solve for x_10

$$x_{10}=\frac{x+640}{20}$$

Steps for Solving Linear Equation

Add x to both sides.

$$x_{10}\times 20=640+x$$

The equation is in standard form.

$$20x_{10}=x+640$$

Divide both sides by 20.

$$\frac{20x_{10}}{20}=\frac{x+640}{20}$$

Dividing by 20 undoes the multiplication by 20.

$$x_{10}=\frac{x+640}{20}$$

Divide 640+x by 20.

$$x_{10}=\frac{x}{20}+32$$