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Simplifying 4 + 3(x + 9) = 12 Reorder the terms: 4 + 3(9 + x) = 12 4 + (9 * 3 + x * 3) = 12 4 + (27 + 3x) = 12 Combine like terms: 4 + 27 = 31 31 + 3x = 12 Solving 31 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-31' to each side of the equation. 31 + -31 + 3x = 12 + -31 Combine like terms: 31 + -31 = 0 0 + 3x = 12 + -31 3x = 12 + -31 Combine like terms: 12 + -31 = -19 3x = -19 Divide each side by '3'. x = -6.333333333 Simplifying x = -6.333333333
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