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Simplifying -15 + -6 = n Combine like terms: -15 + -6 = -21 -21 = n Solving -21 = n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. -21 + -1n = n + -1n Combine like terms: n + -1n = 0 -21 + -1n = 0 Add '21' to each side of the equation. -21 + 21 + -1n = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -1n = 0 + 21 -1n = 0 + 21 Combine like terms: 0 + 21 = 21 -1n = 21 Divide each side by '-1'. n = -21 Simplifying n = -21
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