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Simplifying (X) + (2x + 21) = 180 X + (2x + 21) = 180 Reorder the terms: X + (21 + 2x) = 180 Remove parenthesis around (21 + 2x) X + 21 + 2x = 180 Reorder the terms: 21 + X + 2x = 180 Solving 21 + X + 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 + X + -21 + 2x = 180 + -21 Reorder the terms: 21 + -21 + X + 2x = 180 + -21 Combine like terms: 21 + -21 = 0 0 + X + 2x = 180 + -21 X + 2x = 180 + -21 Combine like terms: 180 + -21 = 159 X + 2x = 159 Add '-2x' to each side of the equation. X + 2x + -2x = 159 + -2x Combine like terms: 2x + -2x = 0 X + 0 = 159 + -2x X = 159 + -2x Simplifying X = 159 + -2x
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