For this case we have the following expression:
[tex]7x + 42 = 42[/tex]
From here, we must clear the value of x.
For this, we apply the following property
:
- Substraction property of equality: Subtract the same number on both sides of equality.
We have then:
[tex]7x + 42-42 = 42-42\\7x = 0[/tex]
Answer:
he used Substraction property of equality
