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Simplifying (n + 8) + (n + -12) = 20n Reorder the terms: (8 + n) + (n + -12) = 20n Remove parenthesis around (8 + n) 8 + n + (n + -12) = 20n Reorder the terms: 8 + n + (-12 + n) = 20n Remove parenthesis around (-12 + n) 8 + n + -12 + n = 20n Reorder the terms: 8 + -12 + n + n = 20n Combine like terms: 8 + -12 = -4 -4 + n + n = 20n Combine like terms: n + n = 2n -4 + 2n = 20n Solving -4 + 2n = 20n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-20n' to each side of the equation. -4 + 2n + -20n = 20n + -20n Combine like terms: 2n + -20n = -18n -4 + -18n = 20n + -20n Combine like terms: 20n + -20n = 0 -4 + -18n = 0 Add '4' to each side of the equation. -4 + 4 + -18n = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -18n = 0 + 4 -18n = 0 + 4 Combine like terms: 0 + 4 = 4 -18n = 4 Divide each side by '-18'. n = -0.2222222222 Simplifying n = -0.2222222222
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