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Simplifying 21 = 3(3x + 4) Reorder the terms: 21 = 3(4 + 3x) 21 = (4 * 3 + 3x * 3) 21 = (12 + 9x) Solving 21 = 12 + 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. 21 + -9x = 12 + 9x + -9x Combine like terms: 9x + -9x = 0 21 + -9x = 12 + 0 21 + -9x = 12 Add '-21' to each side of the equation. 21 + -21 + -9x = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = 12 + -21 -9x = 12 + -21 Combine like terms: 12 + -21 = -9 -9x = -9 Divide each side by '-9'. x = 1 Simplifying x = 1
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