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Simplifying 20 + (2 + r) = x Remove parenthesis around (2 + r) 20 + 2 + r = x Combine like terms: 20 + 2 = 22 22 + r = x Solving 22 + r = x Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + r = -22 + x Combine like terms: 22 + -22 = 0 0 + r = -22 + x r = -22 + x Simplifying r = -22 + x
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