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Simplifying -12 + -9 = x Combine like terms: -12 + -9 = -21 -21 = x Solving -21 = 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. -21 + -1x = x + -1x Combine like terms: x + -1x = 0 -21 + -1x = 0 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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