### Home > CC2 > Chapter 1 > Lesson 1.2.7 > Problem1-126

1-126.

Find a value for $x$ that will make each of the following equations true.

What undoes each operation?

1. $x+8=21$

What plus $8$ is $21$? Or, what does $21−8$ equal?

1. $x-32=55$

What minus $32$ is $55$? Or, what does $55+32$ equal?

$x=87$

1. $3x=54$

$3$ multiplied by what is $54$? Or, what does $54$ divided by $3$ equal?

$18$

1. $\frac{x}{5}=10$

What divided by $5$ is $10$? Or, what does $10$ multiplied by $5$ equal?