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Simplifying x + 3(4 + x) = 20 x + (4 * 3 + x * 3) = 20 x + (12 + 3x) = 20 Reorder the terms: 12 + x + 3x = 20 Combine like terms: x + 3x = 4x 12 + 4x = 20 Solving 12 + 4x = 20 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 + 4x = 20 + -12 Combine like terms: 12 + -12 = 0 0 + 4x = 20 + -12 4x = 20 + -12 Combine like terms: 20 + -12 = 8 4x = 8 Divide each side by '4'. x = 2 Simplifying x = 2
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