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Simplifying 4n + -7(n + -9) = 0 Reorder the terms: 4n + -7(-9 + n) = 0 4n + (-9 * -7 + n * -7) = 0 4n + (63 + -7n) = 0 Reorder the terms: 63 + 4n + -7n = 0 Combine like terms: 4n + -7n = -3n 63 + -3n = 0 Solving 63 + -3n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -3n = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -3n = 0 + -63 -3n = 0 + -63 Combine like terms: 0 + -63 = -63 -3n = -63 Divide each side by '-3'. n = 21 Simplifying n = 21
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