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Simplifying 20 + (a + b) = 0 Remove parenthesis around (a + b) 20 + a + b = 0 Solving 20 + a + b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + a + -20 + b = 0 + -20 Reorder the terms: 20 + -20 + a + b = 0 + -20 Combine like terms: 20 + -20 = 0 0 + a + b = 0 + -20 a + b = 0 + -20 Combine like terms: 0 + -20 = -20 a + b = -20 Add '-1b' to each side of the equation. a + b + -1b = -20 + -1b Combine like terms: b + -1b = 0 a + 0 = -20 + -1b a = -20 + -1b Simplifying a = -20 + -1b
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