Any letter can take the place of a number. A letter that takes
the place of a number is called a variable.

Here's an example:

Rather than writing 3 + __ = 7, you can write 3 + a = 7. In this equation the
letter a = 4.

The letter "a" is called a variable because it can stand for different
numbers. It comes from the word vary, which means to change.

Solve the following equations by determining what number the variable is taking the
place of.

b + 3 = 11

b =

4 + a = 9

a =

x + 8 = 12

x =

7 + a = 16

a =

3 + y =6

y =

b + 0 = 17

b =

a + 5 =10

a =

6 + x = 14

x =

a + 9 = 13

a =

4 + c =7

c =

9 + x = 19

x =

a + 13 =27

a =

x + 15 = 35

x =

12 + n = 24

n =

10 + a = 35

a =

n + 23 = 52

n =

x + 11 = 67

x =

21 + a = 44

a =

33 + s = 98

s =

18 + a = 36

a =

77 + x = 99

x =

32 + b = 43

b =

t + 14 = 28

t =

w + 18 = 29

w =

12 + x = 60

x =

s + 9 = 45

s =

t + 24 = 48

t =

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