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Simplifying 0.8n + 0.4(30 + -1n) = 0.4n + 12 0.8n + (30 * 0.4 + -1n * 0.4) = 0.4n + 12 0.8n + (12 + -0.4n) = 0.4n + 12 Reorder the terms: 12 + 0.8n + -0.4n = 0.4n + 12 Combine like terms: 0.8n + -0.4n = 0.4n 12 + 0.4n = 0.4n + 12 Reorder the terms: 12 + 0.4n = 12 + 0.4n Add '-12' to each side of the equation. 12 + -12 + 0.4n = 12 + -12 + 0.4n Combine like terms: 12 + -12 = 0 0 + 0.4n = 12 + -12 + 0.4n 0.4n = 12 + -12 + 0.4n Combine like terms: 12 + -12 = 0 0.4n = 0 + 0.4n 0.4n = 0.4n Add '-0.4n' to each side of the equation. 0.4n + -0.4n = 0.4n + -0.4n Combine like terms: 0.4n + -0.4n = 0.0 0.0 = 0.4n + -0.4n Combine like terms: 0.4n + -0.4n = 0.0 0.0 = 0.0 Solving 0.0 = 0.0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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