When She Subtracts 4 From Both Sides, Startfraction One-Half Endfraction X Equals Negative Startfraction One-Half Endfraction X. Results. What Is The Value Of ?. When she subtracts 4 from both sides, 21x = −21x results. So, the value of x is 0.

Calculate the value of y. Solve in one variable or many. First, add to both sides to eliminate one of the terms.