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Simplifying (90 + -1n) + (180 + -1n) = 144 Remove parenthesis around (90 + -1n) 90 + -1n + (180 + -1n) = 144 Remove parenthesis around (180 + -1n) 90 + -1n + 180 + -1n = 144 Reorder the terms: 90 + 180 + -1n + -1n = 144 Combine like terms: 90 + 180 = 270 270 + -1n + -1n = 144 Combine like terms: -1n + -1n = -2n 270 + -2n = 144 Solving 270 + -2n = 144 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-270' to each side of the equation. 270 + -270 + -2n = 144 + -270 Combine like terms: 270 + -270 = 0 0 + -2n = 144 + -270 -2n = 144 + -270 Combine like terms: 144 + -270 = -126 -2n = -126 Divide each side by '-2'. n = 63 Simplifying n = 63
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