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Simplifying n + (n + -4) = 90 Reorder the terms: n + (-4 + n) = 90 Remove parenthesis around (-4 + n) n + -4 + n = 90 Reorder the terms: -4 + n + n = 90 Combine like terms: n + n = 2n -4 + 2n = 90 Solving -4 + 2n = 90 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 2n = 90 + 4 Combine like terms: -4 + 4 = 0 0 + 2n = 90 + 4 2n = 90 + 4 Combine like terms: 90 + 4 = 94 2n = 94 Divide each side by '2'. n = 47 Simplifying n = 47
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