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Simplifying (X + 20) + x = 90 Reorder the terms: (20 + X) + x = 90 Remove parenthesis around (20 + X) 20 + X + x = 90 Solving 20 + X + x = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + X + -20 + x = 90 + -20 Reorder the terms: 20 + -20 + X + x = 90 + -20 Combine like terms: 20 + -20 = 0 0 + X + x = 90 + -20 X + x = 90 + -20 Combine like terms: 90 + -20 = 70 X + x = 70 Add '-1x' to each side of the equation. X + x + -1x = 70 + -1x Combine like terms: x + -1x = 0 X + 0 = 70 + -1x X = 70 + -1x Simplifying X = 70 + -1x
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