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Simplifying 2x + x + 9 = 7x + -4x + 9 Reorder the terms: 9 + 2x + x = 7x + -4x + 9 Combine like terms: 2x + x = 3x 9 + 3x = 7x + -4x + 9 Reorder the terms: 9 + 3x = 9 + 7x + -4x Combine like terms: 7x + -4x = 3x 9 + 3x = 9 + 3x Add '-9' to each side of the equation. 9 + -9 + 3x = 9 + -9 + 3x Combine like terms: 9 + -9 = 0 0 + 3x = 9 + -9 + 3x 3x = 9 + -9 + 3x Combine like terms: 9 + -9 = 0 3x = 0 + 3x 3x = 3x Add '-3x' to each side of the equation. 3x + -3x = 3x + -3x Combine like terms: 3x + -3x = 0 0 = 3x + -3x Combine like terms: 3x + -3x = 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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