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Simplifying (3 + -4x) * 3 = 21 Reorder the terms for easier multiplication: 3(3 + -4x) = 21 (3 * 3 + -4x * 3) = 21 (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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