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Simplifying x(9 + 4) = 4(2x + 5) Combine like terms: 9 + 4 = 13 x(13) = 4(2x + 5) Reorder the terms for easier multiplication: 13x = 4(2x + 5) Reorder the terms: 13x = 4(5 + 2x) 13x = (5 * 4 + 2x * 4) 13x = (20 + 8x) Solving 13x = 20 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 13x + -8x = 20 + 8x + -8x Combine like terms: 13x + -8x = 5x 5x = 20 + 8x + -8x Combine like terms: 8x + -8x = 0 5x = 20 + 0 5x = 20 Divide each side by '5'. x = 4 Simplifying x = 4
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