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Simplifying 7(2x + 7) + -21 = 112 Reorder the terms: 7(7 + 2x) + -21 = 112 (7 * 7 + 2x * 7) + -21 = 112 (49 + 14x) + -21 = 112 Reorder the terms: 49 + -21 + 14x = 112 Combine like terms: 49 + -21 = 28 28 + 14x = 112 Solving 28 + 14x = 112 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 + 14x = 112 + -28 Combine like terms: 28 + -28 = 0 0 + 14x = 112 + -28 14x = 112 + -28 Combine like terms: 112 + -28 = 84 14x = 84 Divide each side by '14'. x = 6 Simplifying x = 6
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