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Simplifying x + (x + 21) = 180 Reorder the terms: x + (21 + x) = 180 Remove parenthesis around (21 + x) x + 21 + x = 180 Reorder the terms: 21 + x + x = 180 Combine like terms: x + x = 2x 21 + 2x = 180 Solving 21 + 2x = 180 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 + 2x = 180 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 180 + -21 2x = 180 + -21 Combine like terms: 180 + -21 = 159 2x = 159 Divide each side by '2'. x = 79.5 Simplifying x = 79.5
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