Solve the equation 7x = 15+6 using substitution

Answer 1

To solve the equation 7x = 15 + 6 using substitution, we can substitute the expression for 15 + 6 into the equation.

First, simplify 15 + 6:
15 + 6 = 21

Now, substitute 21 for 15 + 6 in the equation 7x = 15 + 6:
7x = 21

Now, divide both sides of the equation by 7 to solve for x:
7x/7 = 21/7

This simplifies to:
x = 3

Therefore, the solution to the equation 7x = 15 + 6 using substitution is x = 3.