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Simplifying 15x + -1(3x + -9) = 21 Reorder the terms: 15x + -1(-9 + 3x) = 21 15x + (-9 * -1 + 3x * -1) = 21 15x + (9 + -3x) = 21 Reorder the terms: 9 + 15x + -3x = 21 Combine like terms: 15x + -3x = 12x 9 + 12x = 21 Solving 9 + 12x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 12x = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 12x = 21 + -9 12x = 21 + -9 Combine like terms: 21 + -9 = 12 12x = 12 Divide each side by '12'. x = 1 Simplifying x = 1
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