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