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Simplifying 7(2 + -1x) + 9x = 2(x + 7) (2 * 7 + -1x * 7) + 9x = 2(x + 7) (14 + -7x) + 9x = 2(x + 7) Combine like terms: -7x + 9x = 2x 14 + 2x = 2(x + 7) Reorder the terms: 14 + 2x = 2(7 + x) 14 + 2x = (7 * 2 + x * 2) 14 + 2x = (14 + 2x) Add '-14' to each side of the equation. 14 + -14 + 2x = 14 + -14 + 2x Combine like terms: 14 + -14 = 0 0 + 2x = 14 + -14 + 2x 2x = 14 + -14 + 2x Combine like terms: 14 + -14 = 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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