
This equation has an infinite number of solutions, so it will be an identity.
Here are the steps to solve the equation 25 - 4x = 15 - 3x + 10 - x :
25 - 4x = 15 - 3x + 10 - x           Rewrite.  Â
25 + −4x = 15 + −3x + 10 + −x     Â
−4x + 25 = (−3x + −x)+(15 + 10)      Combine the like terms.
−4x + 25 = −4x + 25               Rewrite after grouping like terms.
−4x + 25 + 4x = −4x + 25 + 4x     Add 4x to both sides of the equation. Â
 25 = 25                       Lastly, subtract 25 from both sides.
 25 − 25 = 25 − 25
  0 = 0