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Simplifying 12 + -4n = -15 + -1n Solving 12 + -4n = -15 + -1n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add 'n' to each side of the equation. 12 + -4n + n = -15 + -1n + n Combine like terms: -4n + n = -3n 12 + -3n = -15 + -1n + n Combine like terms: -1n + n = 0 12 + -3n = -15 + 0 12 + -3n = -15 Add '-12' to each side of the equation. 12 + -12 + -3n = -15 + -12 Combine like terms: 12 + -12 = 0 0 + -3n = -15 + -12 -3n = -15 + -12 Combine like terms: -15 + -12 = -27 -3n = -27 Divide each side by '-3'. n = 9 Simplifying n = 9
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