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Simplifying -12 = x + 9 Reorder the terms: -12 = 9 + x Solving -12 = 9 + 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. -12 + -1x = 9 + x + -1x Combine like terms: x + -1x = 0 -12 + -1x = 9 + 0 -12 + -1x = 9 Add '12' to each side of the equation. -12 + 12 + -1x = 9 + 12 Combine like terms: -12 + 12 = 0 0 + -1x = 9 + 12 -1x = 9 + 12 Combine like terms: 9 + 12 = 21 -1x = 21 Divide each side by '-1'. x = -21 Simplifying x = -21
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