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Simplifying -21 = X + -20 Reorder the terms: -21 = -20 + X Solving -21 = -20 + 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 = -20 + X + -1X Combine like terms: X + -1X = 0 -21 + -1X = -20 + 0 -21 + -1X = -20 Add '21' to each side of the equation. -21 + 21 + -1X = -20 + 21 Combine like terms: -21 + 21 = 0 0 + -1X = -20 + 21 -1X = -20 + 21 Combine like terms: -20 + 21 = 1 -1X = 1 Divide each side by '-1'. X = -1 Simplifying X = -1
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