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Simplifying (2x + 10) + (x + 10) = 90 Reorder the terms: (10 + 2x) + (x + 10) = 90 Remove parenthesis around (10 + 2x) 10 + 2x + (x + 10) = 90 Reorder the terms: 10 + 2x + (10 + x) = 90 Remove parenthesis around (10 + x) 10 + 2x + 10 + x = 90 Reorder the terms: 10 + 10 + 2x + x = 90 Combine like terms: 10 + 10 = 20 20 + 2x + x = 90 Combine like terms: 2x + x = 3x 20 + 3x = 90 Solving 20 + 3x = 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 + -20 + 3x = 90 + -20 Combine like terms: 20 + -20 = 0 0 + 3x = 90 + -20 3x = 90 + -20 Combine like terms: 90 + -20 = 70 3x = 70 Divide each side by '3'. x = 23.33333333 Simplifying x = 23.33333333
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