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Simplifying 3(2n + -1) + -2n = 21 Reorder the terms: 3(-1 + 2n) + -2n = 21 (-1 * 3 + 2n * 3) + -2n = 21 (-3 + 6n) + -2n = 21 Combine like terms: 6n + -2n = 4n -3 + 4n = 21 Solving -3 + 4n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 4n = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 4n = 21 + 3 4n = 21 + 3 Combine like terms: 21 + 3 = 24 4n = 24 Divide each side by '4'. n = 6 Simplifying n = 6
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