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Simplifying x + 3(x + 3) = 20 Reorder the terms: x + 3(3 + x) = 20 x + (3 * 3 + x * 3) = 20 x + (9 + 3x) = 20 Reorder the terms: 9 + x + 3x = 20 Combine like terms: x + 3x = 4x 9 + 4x = 20 Solving 9 + 4x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 4x = 20 + -9 Combine like terms: 9 + -9 = 0 0 + 4x = 20 + -9 4x = 20 + -9 Combine like terms: 20 + -9 = 11 4x = 11 Divide each side by '4'. x = 2.75 Simplifying x = 2.75
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