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Simplifying -7 + 7[3 + x] = 63 -7 + [3 * 7 + x * 7] = 63 -7 + [21 + 7x] = 63 Combine like terms: -7 + 21 = 14 14 + 7x = 63 Solving 14 + 7x = 63 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + 7x = 63 + -14 Combine like terms: 14 + -14 = 0 0 + 7x = 63 + -14 7x = 63 + -14 Combine like terms: 63 + -14 = 49 7x = 49 Divide each side by '7'. x = 7 Simplifying x = 7
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