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Simplifying 2x + 9 = 9(x + 1) + -7x Reorder the terms: 9 + 2x = 9(x + 1) + -7x Reorder the terms: 9 + 2x = 9(1 + x) + -7x 9 + 2x = (1 * 9 + x * 9) + -7x 9 + 2x = (9 + 9x) + -7x Combine like terms: 9x + -7x = 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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