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Simplifying 21(7x + 15) = 128 Reorder the terms: 21(15 + 7x) = 128 (15 * 21 + 7x * 21) = 128 (315 + 147x) = 128 Solving 315 + 147x = 128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-315' to each side of the equation. 315 + -315 + 147x = 128 + -315 Combine like terms: 315 + -315 = 0 0 + 147x = 128 + -315 147x = 128 + -315 Combine like terms: 128 + -315 = -187 147x = -187 Divide each side by '147'. x = -1.272108844 Simplifying x = -1.272108844
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