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Simplifying 2n + -3(n + -7) = 12 Reorder the terms: 2n + -3(-7 + n) = 12 2n + (-7 * -3 + n * -3) = 12 2n + (21 + -3n) = 12 Reorder the terms: 21 + 2n + -3n = 12 Combine like terms: 2n + -3n = -1n 21 + -1n = 12 Solving 21 + -1n = 12 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1n = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -1n = 12 + -21 -1n = 12 + -21 Combine like terms: 12 + -21 = -9 -1n = -9 Divide each side by '-1'. n = 9 Simplifying n = 9
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