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

  • 5

  • 7

  • 6

  • 10

The correct answer is 6.

Please Note:
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.