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Simplifying 3(7x + 4) = 138 Reorder the terms: 3(4 + 7x) = 138 (4 * 3 + 7x * 3) = 138 (12 + 21x) = 138 Solving 12 + 21x = 138 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 + 21x = 138 + -12 Combine like terms: 12 + -12 = 0 0 + 21x = 138 + -12 21x = 138 + -12 Combine like terms: 138 + -12 = 126 21x = 126 Divide each side by '21'. x = 6 Simplifying x = 6
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