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Simplifying X + (21 + -1x) = 21 Remove parenthesis around (21 + -1x) X + 21 + -1x = 21 Reorder the terms: 21 + X + -1x = 21 Add '-21' to each side of the equation. 21 + X + -21 + -1x = 21 + -21 Reorder the terms: 21 + -21 + X + -1x = 21 + -21 Combine like terms: 21 + -21 = 0 0 + X + -1x = 21 + -21 X + -1x = 21 + -21 Combine like terms: 21 + -21 = 0 X + -1x = 0 Solving X + -1x = 0 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add 'x' to each side of the equation. X + -1x + x = 0 + x Combine like terms: -1x + x = 0 X + 0 = 0 + x X = 0 + x Remove the zero: X = x Simplifying X = x
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