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Simplifying -3 = x + x + 9 Reorder the terms: -3 = 9 + x + x Combine like terms: x + x = 2x -3 = 9 + 2x Solving -3 = 9 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -3 + -2x = 9 + 2x + -2x Combine like terms: 2x + -2x = 0 -3 + -2x = 9 + 0 -3 + -2x = 9 Add '3' to each side of the equation. -3 + 3 + -2x = 9 + 3 Combine like terms: -3 + 3 = 0 0 + -2x = 9 + 3 -2x = 9 + 3 Combine like terms: 9 + 3 = 12 -2x = 12 Divide each side by '-2'. x = -6 Simplifying x = -6
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