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Simplifying 7(x + 21) = 63 Reorder the terms: 7(21 + x) = 63 (21 * 7 + x * 7) = 63 (147 + 7x) = 63 Solving 147 + 7x = 63 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-147' to each side of the equation. 147 + -147 + 7x = 63 + -147 Combine like terms: 147 + -147 = 0 0 + 7x = 63 + -147 7x = 63 + -147 Combine like terms: 63 + -147 = -84 7x = -84 Divide each side by '7'. x = -12 Simplifying x = -12
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