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