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Simplifying 7(9 + x) = 84 (9 * 7 + x * 7) = 84 (63 + 7x) = 84 Solving 63 + 7x = 84 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 7x = 84 + -63 Combine like terms: 63 + -63 = 0 0 + 7x = 84 + -63 7x = 84 + -63 Combine like terms: 84 + -63 = 21 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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