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Simplifying 2(a + -4) = 28 Reorder the terms: 2(-4 + a) = 28 (-4 * 2 + a * 2) = 28 (-8 + 2a) = 28 Solving -8 + 2a = 28 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 2a = 28 + 8 Combine like terms: -8 + 8 = 0 0 + 2a = 28 + 8 2a = 28 + 8 Combine like terms: 28 + 8 = 36 2a = 36 Divide each side by '2'. a = 18 Simplifying a = 18
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