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Simplifying -21x + 3(7x + 24) = 72 Reorder the terms: -21x + 3(24 + 7x) = 72 -21x + (24 * 3 + 7x * 3) = 72 -21x + (72 + 21x) = 72 Reorder the terms: 72 + -21x + 21x = 72 Combine like terms: -21x + 21x = 0 72 + 0 = 72 72 = 72 Add '-72' to each side of the equation. 72 + -72 = 72 + -72 Combine like terms: 72 + -72 = 0 0 = 72 + -72 Combine like terms: 72 + -72 = 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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