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Simplifying (2x + 20) + (x + 1) = 90 Reorder the terms: (20 + 2x) + (x + 1) = 90 Remove parenthesis around (20 + 2x) 20 + 2x + (x + 1) = 90 Reorder the terms: 20 + 2x + (1 + x) = 90 Remove parenthesis around (1 + x) 20 + 2x + 1 + x = 90 Reorder the terms: 20 + 1 + 2x + x = 90 Combine like terms: 20 + 1 = 21 21 + 2x + x = 90 Combine like terms: 2x + x = 3x 21 + 3x = 90 Solving 21 + 3x = 90 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 + 3x = 90 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 90 + -21 3x = 90 + -21 Combine like terms: 90 + -21 = 69 3x = 69 Divide each side by '3'. x = 23 Simplifying x = 23
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