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Simplifying x + (12 + -1x) + (9 + -1x) = 0 Remove parenthesis around (12 + -1x) x + 12 + -1x + (9 + -1x) = 0 Remove parenthesis around (9 + -1x) x + 12 + -1x + 9 + -1x = 0 Reorder the terms: 12 + 9 + x + -1x + -1x = 0 Combine like terms: 12 + 9 = 21 21 + x + -1x + -1x = 0 Combine like terms: x + -1x = 0 21 + 0 + -1x = 0 21 + -1x = 0 Solving 21 + -1x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 0 + -21 -1x = 0 + -21 Combine like terms: 0 + -21 = -21 -1x = -21 Divide each side by '-1'. x = 21 Simplifying x = 21
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