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Simplifying 9 + 4 = 2n + -1 Combine like terms: 9 + 4 = 13 13 = 2n + -1 Reorder the terms: 13 = -1 + 2n Solving 13 = -1 + 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. 13 + -2n = -1 + 2n + -2n Combine like terms: 2n + -2n = 0 13 + -2n = -1 + 0 13 + -2n = -1 Add '-13' to each side of the equation. 13 + -13 + -2n = -1 + -13 Combine like terms: 13 + -13 = 0 0 + -2n = -1 + -13 -2n = -1 + -13 Combine like terms: -1 + -13 = -14 -2n = -14 Divide each side by '-2'. n = 7 Simplifying n = 7
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