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Simplifying 12x + 15 = 9(x + 8) Reorder the terms: 15 + 12x = 9(x + 8) Reorder the terms: 15 + 12x = 9(8 + x) 15 + 12x = (8 * 9 + x * 9) 15 + 12x = (72 + 9x) Solving 15 + 12x = 72 + 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. 15 + 12x + -9x = 72 + 9x + -9x Combine like terms: 12x + -9x = 3x 15 + 3x = 72 + 9x + -9x Combine like terms: 9x + -9x = 0 15 + 3x = 72 + 0 15 + 3x = 72 Add '-15' to each side of the equation. 15 + -15 + 3x = 72 + -15 Combine like terms: 15 + -15 = 0 0 + 3x = 72 + -15 3x = 72 + -15 Combine like terms: 72 + -15 = 57 3x = 57 Divide each side by '3'. x = 19 Simplifying x = 19
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