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Simplifying n + 7 + n + 2n + -12 + 3n + 4 = 90 Reorder the terms: 7 + -12 + 4 + n + n + 2n + 3n = 90 Combine like terms: 7 + -12 = -5 -5 + 4 + n + n + 2n + 3n = 90 Combine like terms: -5 + 4 = -1 -1 + n + n + 2n + 3n = 90 Combine like terms: n + n = 2n -1 + 2n + 2n + 3n = 90 Combine like terms: 2n + 2n = 4n -1 + 4n + 3n = 90 Combine like terms: 4n + 3n = 7n -1 + 7n = 90 Solving -1 + 7n = 90 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 7n = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 7n = 90 + 1 7n = 90 + 1 Combine like terms: 90 + 1 = 91 7n = 91 Divide each side by '7'. n = 13 Simplifying n = 13
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