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Simplifying 2a + 4 = 28 + -1a Reorder the terms: 4 + 2a = 28 + -1a Solving 4 + 2a = 28 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 4 + 2a + a = 28 + -1a + a Combine like terms: 2a + a = 3a 4 + 3a = 28 + -1a + a Combine like terms: -1a + a = 0 4 + 3a = 28 + 0 4 + 3a = 28 Add '-4' to each side of the equation. 4 + -4 + 3a = 28 + -4 Combine like terms: 4 + -4 = 0 0 + 3a = 28 + -4 3a = 28 + -4 Combine like terms: 28 + -4 = 24 3a = 24 Divide each side by '3'. a = 8 Simplifying a = 8
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