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Simplifying x + (3x + 4) = 20 Reorder the terms: x + (4 + 3x) = 20 Remove parenthesis around (4 + 3x) x + 4 + 3x = 20 Reorder the terms: 4 + x + 3x = 20 Combine like terms: x + 3x = 4x 4 + 4x = 20 Solving 4 + 4x = 20 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 + 4x = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 4x = 20 + -4 4x = 20 + -4 Combine like terms: 20 + -4 = 16 4x = 16 Divide each side by '4'. x = 4 Simplifying x = 4
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