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