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Simplifying 9(8c + -9) = -81 + 72c Reorder the terms: 9(-9 + 8c) = -81 + 72c (-9 * 9 + 8c * 9) = -81 + 72c (-81 + 72c) = -81 + 72c Add '81' to each side of the equation. -81 + 81 + 72c = -81 + 81 + 72c Combine like terms: -81 + 81 = 0 0 + 72c = -81 + 81 + 72c 72c = -81 + 81 + 72c Combine like terms: -81 + 81 = 0 72c = 0 + 72c 72c = 72c Add '-72c' to each side of the equation. 72c + -72c = 72c + -72c Combine like terms: 72c + -72c = 0 0 = 72c + -72c Combine like terms: 72c + -72c = 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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