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Simplifying X + X + -21 = 157 Reorder the terms: -21 + X + X = 157 Combine like terms: X + X = 2X -21 + 2X = 157 Solving -21 + 2X = 157 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 + 2X = 157 + 21 Combine like terms: -21 + 21 = 0 0 + 2X = 157 + 21 2X = 157 + 21 Combine like terms: 157 + 21 = 178 2X = 178 Divide each side by '2'. X = 89 Simplifying X = 89
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