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Simplifying 9 = x + -21 Reorder the terms: 9 = -21 + x Solving 9 = -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. 9 + -1x = -21 + x + -1x Combine like terms: x + -1x = 0 9 + -1x = -21 + 0 9 + -1x = -21 Add '-9' to each side of the equation. 9 + -9 + -1x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = -21 + -9 -1x = -21 + -9 Combine like terms: -21 + -9 = -30 -1x = -30 Divide each side by '-1'. x = 30 Simplifying x = 30
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