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Simplifying 9x + -3 = 5x + -15
  Reorder the terms: -3 + 9x = 5x + -15
  Reorder the terms: -3 + 9x = -15 + 5x
  Solving -3 + 9x = -15 + 5x
 Solving for variable 'x'.
 Move all terms containing x to the left, all other terms to the right.
  Add '-5x' to each side of the equation.
-3 + 9x + -5x = -15 + 5x + -5x
 Combine like terms:
 9x + -5x = 4x -3 + 4x = -15 + 5x + -5x
 Combine like terms:
 5x + -5x = 0 -3 + 4x = -15 + 0 -3 + 4x = -15
  Add '3' to each side of the equation.
 -3 + 3 + 4x = -15 + 3
  Combine like terms: -3 + 3 = 0 0 + 4x = -15 + 3
 4x = -15 + 3
 Combine like terms: -15 + 3 = -12 4x = -12
  Divide each side by '4'.
x = -3 
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