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Simplifying n + -3 + n = 90 Reorder the terms: -3 + n + n = 90 Combine like terms: n + n = 2n -3 + 2n = 90 Solving -3 + 2n = 90 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 2n = 90 + 3 Combine like terms: -3 + 3 = 0 0 + 2n = 90 + 3 2n = 90 + 3 Combine like terms: 90 + 3 = 93 2n = 93 Divide each side by '2'. n = 46.5 Simplifying n = 46.5
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