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Simplifying 42 + 12 = 2n + 12 Combine like terms: 42 + 12 = 54 54 = 2n + 12 Reorder the terms: 54 = 12 + 2n Solving 54 = 12 + 2n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-2n' to each side of the equation. 54 + -2n = 12 + 2n + -2n Combine like terms: 2n + -2n = 0 54 + -2n = 12 + 0 54 + -2n = 12 Add '-54' to each side of the equation. 54 + -54 + -2n = 12 + -54 Combine like terms: 54 + -54 = 0 0 + -2n = 12 + -54 -2n = 12 + -54 Combine like terms: 12 + -54 = -42 -2n = -42 Divide each side by '-2'. n = 21 Simplifying n = 21
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