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Simplifying 156 = 3(7n + 3) Reorder the terms: 156 = 3(3 + 7n) 156 = (3 * 3 + 7n * 3) 156 = (9 + 21n) Solving 156 = 9 + 21n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21n' to each side of the equation. 156 + -21n = 9 + 21n + -21n Combine like terms: 21n + -21n = 0 156 + -21n = 9 + 0 156 + -21n = 9 Add '-156' to each side of the equation. 156 + -156 + -21n = 9 + -156 Combine like terms: 156 + -156 = 0 0 + -21n = 9 + -156 -21n = 9 + -156 Combine like terms: 9 + -156 = -147 -21n = -147 Divide each side by '-21'. n = 7 Simplifying n = 7
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