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Simplifying (5x + 20) + 9x = (5x + 20 + 9x) Reorder the terms: (20 + 5x) + 9x = (5x + 20 + 9x) Remove parenthesis around (20 + 5x) 20 + 5x + 9x = (5x + 20 + 9x) Combine like terms: 5x + 9x = 14x 20 + 14x = (5x + 20 + 9x) Reorder the terms: 20 + 14x = (20 + 5x + 9x) Combine like terms: 5x + 9x = 14x 20 + 14x = (20 + 14x) Remove parenthesis around (20 + 14x) 20 + 14x = 20 + 14x Add '-20' to each side of the equation. 20 + -20 + 14x = 20 + -20 + 14x Combine like terms: 20 + -20 = 0 0 + 14x = 20 + -20 + 14x 14x = 20 + -20 + 14x Combine like terms: 20 + -20 = 0 14x = 0 + 14x 14x = 14x Add '-14x' to each side of the equation. 14x + -14x = 14x + -14x Combine like terms: 14x + -14x = 0 0 = 14x + -14x Combine like terms: 14x + -14x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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