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Simplifying 21X = (X * 9) * 13 Reorder the terms for easier multiplication: 21X = (9X) * 13 Remove parenthesis around (9X) 21X = 9X * 13 Reorder the terms for easier multiplication: 21X = 9 * 13X Multiply 9 * 13 21X = 117X Solving 21X = 117X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-117X' to each side of the equation. 21X + -117X = 117X + -117X Combine like terms: 21X + -117X = -96X -96X = 117X + -117X Combine like terms: 117X + -117X = 0 -96X = 0 Divide each side by '-96'. X = 0 Simplifying X = 0
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