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Simplifying (X + 20) + 63 = 90 Reorder the terms: (20 + X) + 63 = 90 Remove parenthesis around (20 + X) 20 + X + 63 = 90 Reorder the terms: 20 + 63 + X = 90 Combine like terms: 20 + 63 = 83 83 + X = 90 Solving 83 + X = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-83' to each side of the equation. 83 + -83 + X = 90 + -83 Combine like terms: 83 + -83 = 0 0 + X = 90 + -83 X = 90 + -83 Combine like terms: 90 + -83 = 7 X = 7 Simplifying X = 7
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