The equation 3x + 4 = 5x - 4 has the solution set {4}.
a. explain why the equation (3x + 4) + 4 = (5x - 4) + 4 also has the solution set {4}.

Why the equation (3x + 4) + 4 = (5x - 4) + 4 also has the solution set {4}.

It´s because 4 is the only value that satisfies the statement.

Step-by-step explanation:

As you can see the terms in parentheses on both sides of the equation are added to 4.

 (3x + 4) + 4 = (5x - 4) + 4

So we can set the equation as.

 3x + 4 = 5x - 4

 Subtract 3x on both sides of equation.

 4 = 2x - 4

 Add 4 on both sides of equation.

 8 = 2x

 Divide both sides of equation by 2.

 4 = x

 4 is the only value that satisfies the statement.

justin bieber ml.