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Simplifying 12(x + 21) = 420 Reorder the terms: 12(21 + x) = 420 (21 * 12 + x * 12) = 420 (252 + 12x) = 420 Solving 252 + 12x = 420 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-252' to each side of the equation. 252 + -252 + 12x = 420 + -252 Combine like terms: 252 + -252 = 0 0 + 12x = 420 + -252 12x = 420 + -252 Combine like terms: 420 + -252 = 168 12x = 168 Divide each side by '12'. x = 14 Simplifying x = 14
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