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Simplifying 7x + 9 + -9x = 12 + -13x + 11x + -3 Reorder the terms: 9 + 7x + -9x = 12 + -13x + 11x + -3 Combine like terms: 7x + -9x = -2x 9 + -2x = 12 + -13x + 11x + -3 Reorder the terms: 9 + -2x = 12 + -3 + -13x + 11x Combine like terms: 12 + -3 = 9 9 + -2x = 9 + -13x + 11x Combine like terms: -13x + 11x = -2x 9 + -2x = 9 + -2x Add '-9' to each side of the equation. 9 + -9 + -2x = 9 + -9 + -2x Combine like terms: 9 + -9 = 0 0 + -2x = 9 + -9 + -2x -2x = 9 + -9 + -2x Combine like terms: 9 + -9 = 0 -2x = 0 + -2x -2x = -2x Add '2x' to each side of the equation. -2x + 2x = -2x + 2x Combine like terms: -2x + 2x = 0 0 = -2x + 2x Combine like terms: -2x + 2x = 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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