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Simplifying -4 + 3(1 + 2a) = 20 -4 + (1 * 3 + 2a * 3) = 20 -4 + (3 + 6a) = 20 Combine like terms: -4 + 3 = -1 -1 + 6a = 20 Solving -1 + 6a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 6a = 20 + 1 Combine like terms: -1 + 1 = 0 0 + 6a = 20 + 1 6a = 20 + 1 Combine like terms: 20 + 1 = 21 6a = 21 Divide each side by '6'. a = 3.5 Simplifying a = 3.5
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