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Simplifying 15 + 5x(9 + 12) = 45 Combine like terms: 9 + 12 = 21 15 + 5x(21) = 45 Reorder the terms for easier multiplication: 15 + 5 * 21x = 45 Multiply 5 * 21 15 + 105x = 45 Solving 15 + 105x = 45 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 + 105x = 45 + -15 Combine like terms: 15 + -15 = 0 0 + 105x = 45 + -15 105x = 45 + -15 Combine like terms: 45 + -15 = 30 105x = 30 Divide each side by '105'. x = 0.2857142857 Simplifying x = 0.2857142857
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