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Simplifying 7(9 + 7x) + 21 = 0 (9 * 7 + 7x * 7) + 21 = 0 (63 + 49x) + 21 = 0 Reorder the terms: 63 + 21 + 49x = 0 Combine like terms: 63 + 21 = 84 84 + 49x = 0 Solving 84 + 49x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 49x = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 49x = 0 + -84 49x = 0 + -84 Combine like terms: 0 + -84 = -84 49x = -84 Divide each side by '49'. x = -1.714285714 Simplifying x = -1.714285714
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