### Home > CC3 > Chapter 4 > Lesson 4.1.4 > Problem4-40

4-40.

I am thinking of a number. When I double my number and then subtract the result from five, I get negative one. What is my number? Write and solve an equation.

Assign the number a variable.

Example: The number $=x$

Put the words into an equation.

When I double my number.

$2x$

Then subtract the result from five.

$5−2x$.

I get negative one.

$5−2x=−1$

Solve for $x$.

$x=3$