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Simplifying 12(n + 7) = 4(21 + 3n) Reorder the terms: 12(7 + n) = 4(21 + 3n) (7 * 12 + n * 12) = 4(21 + 3n) (84 + 12n) = 4(21 + 3n) 84 + 12n = (21 * 4 + 3n * 4) 84 + 12n = (84 + 12n) Add '-84' to each side of the equation. 84 + -84 + 12n = 84 + -84 + 12n Combine like terms: 84 + -84 = 0 0 + 12n = 84 + -84 + 12n 12n = 84 + -84 + 12n Combine like terms: 84 + -84 = 0 12n = 0 + 12n 12n = 12n Add '-12n' to each side of the equation. 12n + -12n = 12n + -12n Combine like terms: 12n + -12n = 0 0 = 12n + -12n Combine like terms: 12n + -12n = 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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