Genevieve wants to verify that Negative x is the simplified expression of One-fifth (5 x minus 20) minus one-half (4 x minus 8). Which procedure can Genevieve follow to verify this? Add One-fifth (5 x minus 20) minus one-half (4 x minus 8) and Negative x. Put an equal sign between One-fifth (5 x minus 20) minus one-half (4 x minus 8) and One-fifth (5 x minus 20) minus one-half (4 x minus 8) and then solve for x. Substitute 5 into the first expression, substitute 4 into the second expression, and evaluate them. Substitute 5 into each expression and evaluate them.