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Simplifying [3x + 4] = 12 Reorder the terms: [4 + 3x] = 12 Remove brackets around [4 + 3x] 4 + 3x = 12 Solving 4 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 3x = 12 + -4 Combine like terms: 4 + -4 = 0 0 + 3x = 12 + -4 3x = 12 + -4 Combine like terms: 12 + -4 = 8 3x = 8 Divide each side by '3'. x = 2.666666667 Simplifying x = 2.666666667
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