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Simplifying X + (x + 21) = 0 Reorder the terms: X + (21 + x) = 0 Remove parenthesis around (21 + x) X + 21 + x = 0 Reorder the terms: 21 + X + x = 0 Solving 21 + X + x = 0 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 + X + -21 + x = 0 + -21 Reorder the terms: 21 + -21 + X + x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + X + x = 0 + -21 X + x = 0 + -21 Combine like terms: 0 + -21 = -21 X + x = -21 Add '-1x' to each side of the equation. X + x + -1x = -21 + -1x Combine like terms: x + -1x = 0 X + 0 = -21 + -1x X = -21 + -1x Simplifying X = -21 + -1x
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