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Simplifying 12 + -3n = 15 Solving 12 + -3n = 15 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. 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 = 3 -3n = 3 Divide each side by '-3'. n = -1 Simplifying n = -1
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