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Simplifying 2(7x + 21) = 28 Reorder the terms: 2(21 + 7x) = 28 (21 * 2 + 7x * 2) = 28 (42 + 14x) = 28 Solving 42 + 14x = 28 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 14x = 28 + -42 Combine like terms: 42 + -42 = 0 0 + 14x = 28 + -42 14x = 28 + -42 Combine like terms: 28 + -42 = -14 14x = -14 Divide each side by '14'. x = -1 Simplifying x = -1
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