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Simplifying 21(x + 15) = 78 Reorder the terms: 21(15 + x) = 78 (15 * 21 + x * 21) = 78 (315 + 21x) = 78 Solving 315 + 21x = 78 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 + 21x = 78 + -315 Combine like terms: 315 + -315 = 0 0 + 21x = 78 + -315 21x = 78 + -315 Combine like terms: 78 + -315 = -237 21x = -237 Divide each side by '21'. x = -11.28571429 Simplifying x = -11.28571429
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