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Simplifying (2x + 9) + (2x + 1) + 90 = 180 Reorder the terms: (9 + 2x) + (2x + 1) + 90 = 180 Remove parenthesis around (9 + 2x) 9 + 2x + (2x + 1) + 90 = 180 Reorder the terms: 9 + 2x + (1 + 2x) + 90 = 180 Remove parenthesis around (1 + 2x) 9 + 2x + 1 + 2x + 90 = 180 Reorder the terms: 9 + 1 + 90 + 2x + 2x = 180 Combine like terms: 9 + 1 = 10 10 + 90 + 2x + 2x = 180 Combine like terms: 10 + 90 = 100 100 + 2x + 2x = 180 Combine like terms: 2x + 2x = 4x 100 + 4x = 180 Solving 100 + 4x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + 4x = 180 + -100 Combine like terms: 100 + -100 = 0 0 + 4x = 180 + -100 4x = 180 + -100 Combine like terms: 180 + -100 = 80 4x = 80 Divide each side by '4'. x = 20 Simplifying x = 20
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