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Simplifying 2(2x) = x + 9 Remove parenthesis around (2x) 2 * 2x = x + 9 Multiply 2 * 2 4x = x + 9 Reorder the terms: 4x = 9 + x Solving 4x = 9 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 4x + -1x = 9 + x + -1x Combine like terms: 4x + -1x = 3x 3x = 9 + x + -1x Combine like terms: x + -1x = 0 3x = 9 + 0 3x = 9 Divide each side by '3'. x = 3 Simplifying x = 3
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