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Simplifying 20x + 7(4 + -1x) = 55 20x + (4 * 7 + -1x * 7) = 55 20x + (28 + -7x) = 55 Reorder the terms: 28 + 20x + -7x = 55 Combine like terms: 20x + -7x = 13x 28 + 13x = 55 Solving 28 + 13x = 55 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 13x = 55 + -28 Combine like terms: 28 + -28 = 0 0 + 13x = 55 + -28 13x = 55 + -28 Combine like terms: 55 + -28 = 27 13x = 27 Divide each side by '13'. x = 2.076923077 Simplifying x = 2.076923077
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