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Simplifying -21 + x = -20 Solving -21 + x = -20 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 = -20 + 21 Combine like terms: -21 + 21 = 0 0 + x = -20 + 21 x = -20 + 21 Combine like terms: -20 + 21 = 1 x = 1 Simplifying x = 1
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