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Simplifying 3(c + 7) = 3c + 21 Reorder the terms: 3(7 + c) = 3c + 21 (7 * 3 + c * 3) = 3c + 21 (21 + 3c) = 3c + 21 Reorder the terms: 21 + 3c = 21 + 3c Add '-21' to each side of the equation. 21 + -21 + 3c = 21 + -21 + 3c Combine like terms: 21 + -21 = 0 0 + 3c = 21 + -21 + 3c 3c = 21 + -21 + 3c Combine like terms: 21 + -21 = 0 3c = 0 + 3c 3c = 3c Add '-3c' to each side of the equation. 3c + -3c = 3c + -3c Combine like terms: 3c + -3c = 0 0 = 3c + -3c Combine like terms: 3c + -3c = 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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