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Simplifying 2x + x + (90 + x) = 180 Remove parenthesis around (90 + x) 2x + x + 90 + x = 180 Reorder the terms: 90 + 2x + x + x = 180 Combine like terms: 2x + x = 3x 90 + 3x + x = 180 Combine like terms: 3x + x = 4x 90 + 4x = 180 Solving 90 + 4x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 4x = 180 + -90 Combine like terms: 90 + -90 = 0 0 + 4x = 180 + -90 4x = 180 + -90 Combine like terms: 180 + -90 = 90 4x = 90 Divide each side by '4'. x = 22.5 Simplifying x = 22.5
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