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Simplifying -9 + -4n = -3(2n + 1) Reorder the terms: -9 + -4n = -3(1 + 2n) -9 + -4n = (1 * -3 + 2n * -3) -9 + -4n = (-3 + -6n) Solving -9 + -4n = -3 + -6n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '6n' to each side of the equation. -9 + -4n + 6n = -3 + -6n + 6n Combine like terms: -4n + 6n = 2n -9 + 2n = -3 + -6n + 6n Combine like terms: -6n + 6n = 0 -9 + 2n = -3 + 0 -9 + 2n = -3 Add '9' to each side of the equation. -9 + 9 + 2n = -3 + 9 Combine like terms: -9 + 9 = 0 0 + 2n = -3 + 9 2n = -3 + 9 Combine like terms: -3 + 9 = 6 2n = 6 Divide each side by '2'. n = 3 Simplifying n = 3
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