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Simplifying -20x + -1(7x + -3) = 81 Reorder the terms: -20x + -1(-3 + 7x) = 81 -20x + (-3 * -1 + 7x * -1) = 81 -20x + (3 + -7x) = 81 Reorder the terms: 3 + -20x + -7x = 81 Combine like terms: -20x + -7x = -27x 3 + -27x = 81 Solving 3 + -27x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -27x = 81 + -3 Combine like terms: 3 + -3 = 0 0 + -27x = 81 + -3 -27x = 81 + -3 Combine like terms: 81 + -3 = 78 -27x = 78 Divide each side by '-27'. x = -2.888888889 Simplifying x = -2.888888889
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