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Simplifying x + 4(x + 3) = 12 Reorder the terms: x + 4(3 + x) = 12 x + (3 * 4 + x * 4) = 12 x + (12 + 4x) = 12 Reorder the terms: 12 + x + 4x = 12 Combine like terms: x + 4x = 5x 12 + 5x = 12 Add '-12' to each side of the equation. 12 + -12 + 5x = 12 + -12 Combine like terms: 12 + -12 = 0 0 + 5x = 12 + -12 5x = 12 + -12 Combine like terms: 12 + -12 = 0 5x = 0 Solving 5x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '5'. x = 0 Simplifying x = 0
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