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Simplifying 21 = n + -15 Reorder the terms: 21 = -15 + n Solving 21 = -15 + 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 = -15 + n + -1n Combine like terms: n + -1n = 0 21 + -1n = -15 + 0 21 + -1n = -15 Add '-21' to each side of the equation. 21 + -21 + -1n = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -1n = -15 + -21 -1n = -15 + -21 Combine like terms: -15 + -21 = -36 -1n = -36 Divide each side by '-1'. n = 36 Simplifying n = 36
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