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Simplifying (9x + 4x) + 7x = 9x + (4x + 7x) Combine like terms: 9x + 4x = 13x (13x) + 7x = 9x + (4x + 7x) (13x) + 7x = 9x + (4x + 7x) Combine like terms: (13x) + 7x = 20x 20x = 9x + (4x + 7x) Combine like terms: 4x + 7x = 11x 20x = 9x + (11x) 20x = 9x + (11x) Combine like terms: 9x + (11x) = 20x 20x = 20x Add '-20x' to each side of the equation. 20x + -20x = 20x + -20x Combine like terms: 20x + -20x = 0 0 = 20x + -20x Combine like terms: 20x + -20x = 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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