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Simplifying 6n + -15 = 2n + 21 Reorder the terms: -15 + 6n = 2n + 21 Reorder the terms: -15 + 6n = 21 + 2n Solving -15 + 6n = 21 + 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. -15 + 6n + -2n = 21 + 2n + -2n Combine like terms: 6n + -2n = 4n -15 + 4n = 21 + 2n + -2n Combine like terms: 2n + -2n = 0 -15 + 4n = 21 + 0 -15 + 4n = 21 Add '15' to each side of the equation. -15 + 15 + 4n = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 4n = 21 + 15 4n = 21 + 15 Combine like terms: 21 + 15 = 36 4n = 36 Divide each side by '4'. n = 9 Simplifying n = 9
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