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Simplifying 2x + -2(2x + -9) = 9 Reorder the terms: 2x + -2(-9 + 2x) = 9 2x + (-9 * -2 + 2x * -2) = 9 2x + (18 + -4x) = 9 Reorder the terms: 18 + 2x + -4x = 9 Combine like terms: 2x + -4x = -2x 18 + -2x = 9 Solving 18 + -2x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -2x = 9 + -18 Combine like terms: 18 + -18 = 0 0 + -2x = 9 + -18 -2x = 9 + -18 Combine like terms: 9 + -18 = -9 -2x = -9 Divide each side by '-2'. x = 4.5 Simplifying x = 4.5
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