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Find the value of x.
$x\;\; +\;\; 15 \quad=\quad 21$

• 5

• 7

• 6

• 10

Use inverse operations to solve the equation for a variable.

Solution:
To solve the given equation for variable x, we use inverse operations.

Given equation:
x + 15 = 21

Now, subtract 15 from both sides and simplify.

x + 15 – 15  =  21 – 15

⇒            x   =   6

So, the value of x is 6.