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x = 3
219
Cross multiply: x * 9 = 21 * 3 Simplifying x * 9 = 21 * 3 Reorder the terms for easier multiplication: 9x = 21 * 3 Multiply 21 * 3 9x = 63 Solving 9x = 63 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '9'. x = 7 Simplifying x = 7
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