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Simplifying 7n + -7 = 21 Reorder the terms: -7 + 7n = 21 Solving -7 + 7n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 7n = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 7n = 21 + 7 7n = 21 + 7 Combine like terms: 21 + 7 = 28 7n = 28 Divide each side by '7'. n = 4 Simplifying n = 4
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