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Simplifying (3x + 1) * 7 = 12 Reorder the terms: (1 + 3x) * 7 = 12 Reorder the terms for easier multiplication: 7(1 + 3x) = 12 (1 * 7 + 3x * 7) = 12 (7 + 21x) = 12 Solving 7 + 21x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 21x = 12 + -7 Combine like terms: 7 + -7 = 0 0 + 21x = 12 + -7 21x = 12 + -7 Combine like terms: 12 + -7 = 5 21x = 5 Divide each side by '21'. x = 0.2380952381 Simplifying x = 0.2380952381
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