Roberto needs to buy 75 stamps to send out invitations for his birthday party. Will 3 sheets of stamps be enough? How do you know?

C. Use properties of equality to get the variable on one side of the equation and constant terms on the other.

Step-by-step explanation:

In solving an equation, It is true that properties of equality should be used by putting the variable on one side and the constant on the other side.

  Now let use an example to drive this;

    Given:

         2x - 9 = x + 8

This is an equation, and what we have on both sides should be equal.

      Collect like terms;

        2x - x = 8 + 9

           x  = 17

So the solution is 17.

This is the best way to solve an equation.