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