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Simplifying 9x + -81 = 9(x + -9) Reorder the terms: -81 + 9x = 9(x + -9) Reorder the terms: -81 + 9x = 9(-9 + x) -81 + 9x = (-9 * 9 + x * 9) -81 + 9x = (-81 + 9x) Add '81' to each side of the equation. -81 + 81 + 9x = -81 + 81 + 9x Combine like terms: -81 + 81 = 0 0 + 9x = -81 + 81 + 9x 9x = -81 + 81 + 9x Combine like terms: -81 + 81 = 0 9x = 0 + 9x 9x = 9x Add '-9x' to each side of the equation. 9x + -9x = 9x + -9x Combine like terms: 9x + -9x = 0 0 = 9x + -9x Combine like terms: 9x + -9x = 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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