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Simplifying 3(3 + 4) = n + 15 Combine like terms: 3 + 4 = 7 3(7) = n + 15 Multiply 3 * 7 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 = -6 -1n = -6 Divide each side by '-1'. n = 6 Simplifying n = 6
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