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Simplifying 5x + 3(2x + 5) = 81 Reorder the terms: 5x + 3(5 + 2x) = 81 5x + (5 * 3 + 2x * 3) = 81 5x + (15 + 6x) = 81 Reorder the terms: 15 + 5x + 6x = 81 Combine like terms: 5x + 6x = 11x 15 + 11x = 81 Solving 15 + 11x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 11x = 81 + -15 Combine like terms: 15 + -15 = 0 0 + 11x = 81 + -15 11x = 81 + -15 Combine like terms: 81 + -15 = 66 11x = 66 Divide each side by '11'. x = 6 Simplifying x = 6
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