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Simplifying (4x + 2x) + 7x = 4x + (2x + 7x) Combine like terms: 4x + 2x = 6x (6x) + 7x = 4x + (2x + 7x) (6x) + 7x = 4x + (2x + 7x) Combine like terms: (6x) + 7x = 13x 13x = 4x + (2x + 7x) Combine like terms: 2x + 7x = 9x 13x = 4x + (9x) 13x = 4x + (9x) Combine like terms: 4x + (9x) = 13x 13x = 13x Add '-13x' to each side of the equation. 13x + -13x = 13x + -13x Combine like terms: 13x + -13x = 0 0 = 13x + -13x Combine like terms: 13x + -13x = 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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