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Simplifying 3 * 7 + 9 = 3(7 + N) Multiply 3 * 7 21 + 9 = 3(7 + N) Combine like terms: 21 + 9 = 30 30 = 3(7 + N) 30 = (7 * 3 + N * 3) 30 = (21 + 3N) Solving 30 = 21 + 3N Solving for variable 'N'. Move all terms containing N to the left, all other terms to the right. Add '-3N' to each side of the equation. 30 + -3N = 21 + 3N + -3N Combine like terms: 3N + -3N = 0 30 + -3N = 21 + 0 30 + -3N = 21 Add '-30' to each side of the equation. 30 + -30 + -3N = 21 + -30 Combine like terms: 30 + -30 = 0 0 + -3N = 21 + -30 -3N = 21 + -30 Combine like terms: 21 + -30 = -9 -3N = -9 Divide each side by '-3'. N = 3 Simplifying N = 3
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