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Simplifying ((5 + x) + 7) * 7 = 121 Remove parenthesis around (5 + x) (5 + x + 7) * 7 = 121 Reorder the terms: (5 + 7 + x) * 7 = 121 Combine like terms: 5 + 7 = 12 (12 + x) * 7 = 121 Reorder the terms for easier multiplication: 7(12 + x) = 121 (12 * 7 + x * 7) = 121 (84 + 7x) = 121 Solving 84 + 7x = 121 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 + 7x = 121 + -84 Combine like terms: 84 + -84 = 0 0 + 7x = 121 + -84 7x = 121 + -84 Combine like terms: 121 + -84 = 37 7x = 37 Divide each side by '7'. x = 5.285714286 Simplifying x = 5.285714286
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