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Simplifying (5x) * 2 = 9x + 21 Remove parenthesis around (5x) 5x * 2 = 9x + 21 Reorder the terms for easier multiplication: 5 * 2x = 9x + 21 Multiply 5 * 2 10x = 9x + 21 Reorder the terms: 10x = 21 + 9x Solving 10x = 21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 10x + -9x = 21 + 9x + -9x Combine like terms: 10x + -9x = 1x 1x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 1x = 21 + 0 1x = 21 Divide each side by '1'. x = 21 Simplifying x = 21
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