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Simplifying 21x + -1(3x + -9) = 18 Reorder the terms: 21x + -1(-9 + 3x) = 18 21x + (-9 * -1 + 3x * -1) = 18 21x + (9 + -3x) = 18 Reorder the terms: 9 + 21x + -3x = 18 Combine like terms: 21x + -3x = 18x 9 + 18x = 18 Solving 9 + 18x = 18 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 + 18x = 18 + -9 Combine like terms: 9 + -9 = 0 0 + 18x = 18 + -9 18x = 18 + -9 Combine like terms: 18 + -9 = 9 18x = 9 Divide each side by '18'. x = 0.5 Simplifying x = 0.5
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