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Simplifying n + 7 + n + 2n + -12 = 90cm Reorder the terms: 7 + -12 + n + n + 2n = 90cm Combine like terms: 7 + -12 = -5 -5 + n + n + 2n = 90cm Combine like terms: n + n = 2n -5 + 2n + 2n = 90cm Combine like terms: 2n + 2n = 4n -5 + 4n = 90cm Solving -5 + 4n = 90cm Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 4n = 5 + 90cm Combine like terms: -5 + 5 = 0 0 + 4n = 5 + 90cm 4n = 5 + 90cm Divide each side by '4'. n = 1.25 + 22.5cm Simplifying n = 1.25 + 22.5cm
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