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Simplifying a + 128 = -3a + -28 Reorder the terms: 128 + a = -3a + -28 Reorder the terms: 128 + a = -28 + -3a Solving 128 + a = -28 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. 128 + a + 3a = -28 + -3a + 3a Combine like terms: a + 3a = 4a 128 + 4a = -28 + -3a + 3a Combine like terms: -3a + 3a = 0 128 + 4a = -28 + 0 128 + 4a = -28 Add '-128' to each side of the equation. 128 + -128 + 4a = -28 + -128 Combine like terms: 128 + -128 = 0 0 + 4a = -28 + -128 4a = -28 + -128 Combine like terms: -28 + -128 = -156 4a = -156 Divide each side by '4'. a = -39 Simplifying a = -39
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