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Simplifying 2a + -4 + b = 20 Reorder the terms: -4 + 2a + b = 20 Solving -4 + 2a + b = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 2a + 4 + b = 20 + 4 Reorder the terms: -4 + 4 + 2a + b = 20 + 4 Combine like terms: -4 + 4 = 0 0 + 2a + b = 20 + 4 2a + b = 20 + 4 Combine like terms: 20 + 4 = 24 2a + b = 24 Add '-1b' to each side of the equation. 2a + b + -1b = 24 + -1b Combine like terms: b + -1b = 0 2a + 0 = 24 + -1b 2a = 24 + -1b Divide each side by '2'. a = 12 + -0.5b Simplifying a = 12 + -0.5b
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