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Simplifying x + -21 = 7 Reorder the terms: -21 + x = 7 Solving -21 + x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + x = 7 + 21 Combine like terms: -21 + 21 = 0 0 + x = 7 + 21 x = 7 + 21 Combine like terms: 7 + 21 = 28 x = 28 Simplifying x = 28
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