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Simplifying -20 + -7n = -1(-4 + -3n) + -7n -20 + -7n = (-4 * -1 + -3n * -1) + -7n -20 + -7n = (4 + 3n) + -7n Combine like terms: 3n + -7n = -4n -20 + -7n = 4 + -4n Solving -20 + -7n = 4 + -4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '4n' to each side of the equation. -20 + -7n + 4n = 4 + -4n + 4n Combine like terms: -7n + 4n = -3n -20 + -3n = 4 + -4n + 4n Combine like terms: -4n + 4n = 0 -20 + -3n = 4 + 0 -20 + -3n = 4 Add '20' to each side of the equation. -20 + 20 + -3n = 4 + 20 Combine like terms: -20 + 20 = 0 0 + -3n = 4 + 20 -3n = 4 + 20 Combine like terms: 4 + 20 = 24 -3n = 24 Divide each side by '-3'. n = -8 Simplifying n = -8
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