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Simplifying x + -2(x + -2) = 9 Reorder the terms: x + -2(-2 + x) = 9 x + (-2 * -2 + x * -2) = 9 x + (4 + -2x) = 9 Reorder the terms: 4 + x + -2x = 9 Combine like terms: x + -2x = -1x 4 + -1x = 9 Solving 4 + -1x = 9 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 + -1x = 9 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 9 + -4 -1x = 9 + -4 Combine like terms: 9 + -4 = 5 -1x = 5 Divide each side by '-1'. x = -5 Simplifying x = -5
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