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Simplifying -3(n + -7) = 3 + -2n Reorder the terms: -3(-7 + n) = 3 + -2n (-7 * -3 + n * -3) = 3 + -2n (21 + -3n) = 3 + -2n Solving 21 + -3n = 3 + -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. 21 + -3n + 2n = 3 + -2n + 2n Combine like terms: -3n + 2n = -1n 21 + -1n = 3 + -2n + 2n Combine like terms: -2n + 2n = 0 21 + -1n = 3 + 0 21 + -1n = 3 Add '-21' to each side of the equation. 21 + -21 + -1n = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -1n = 3 + -21 -1n = 3 + -21 Combine like terms: 3 + -21 = -18 -1n = -18 Divide each side by '-1'. n = 18 Simplifying n = 18
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