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Simplifying x + -1(-2x) = x + 9 Remove parenthesis around (-2x) x + -1 * -2x = x + 9 Multiply -1 * -2 x + 2x = x + 9 Combine like terms: x + 2x = 3x 3x = x + 9 Reorder the terms: 3x = 9 + x Solving 3x = 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. 3x + -1x = 9 + x + -1x Combine like terms: 3x + -1x = 2x 2x = 9 + x + -1x Combine like terms: x + -1x = 0 2x = 9 + 0 2x = 9 Divide each side by '2'. x = 4.5 Simplifying x = 4.5
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