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Simplifying 3(7n + -3) = 138 Reorder the terms: 3(-3 + 7n) = 138 (-3 * 3 + 7n * 3) = 138 (-9 + 21n) = 138 Solving -9 + 21n = 138 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 21n = 138 + 9 Combine like terms: -9 + 9 = 0 0 + 21n = 138 + 9 21n = 138 + 9 Combine like terms: 138 + 9 = 147 21n = 147 Divide each side by '21'. n = 7 Simplifying n = 7
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