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Simplifying N + 2(n + 20) = 70 Reorder the terms: N + 2(20 + n) = 70 N + (20 * 2 + n * 2) = 70 N + (40 + 2n) = 70 Reorder the terms: 40 + N + 2n = 70 Solving 40 + N + 2n = 70 Solving for variable 'N'. Move all terms containing N to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + N + -40 + 2n = 70 + -40 Reorder the terms: 40 + -40 + N + 2n = 70 + -40 Combine like terms: 40 + -40 = 0 0 + N + 2n = 70 + -40 N + 2n = 70 + -40 Combine like terms: 70 + -40 = 30 N + 2n = 30 Add '-2n' to each side of the equation. N + 2n + -2n = 30 + -2n Combine like terms: 2n + -2n = 0 N + 0 = 30 + -2n N = 30 + -2n Simplifying N = 30 + -2n
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