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Simplifying 21 = 3(4 + x) 21 = (4 * 3 + x * 3) 21 = (12 + 3x) Solving 21 = 12 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 21 + -3x = 12 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -3x = 12 + 0 21 + -3x = 12 Add '-21' to each side of the equation. 21 + -21 + -3x = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 12 + -21 -3x = 12 + -21 Combine like terms: 12 + -21 = -9 -3x = -9 Divide each side by '-3'. x = 3 Simplifying x = 3
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