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Simplifying a + 28 = 3a + 12 Reorder the terms: 28 + a = 3a + 12 Reorder the terms: 28 + a = 12 + 3a Solving 28 + a = 12 + 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. 28 + a + -3a = 12 + 3a + -3a Combine like terms: a + -3a = -2a 28 + -2a = 12 + 3a + -3a Combine like terms: 3a + -3a = 0 28 + -2a = 12 + 0 28 + -2a = 12 Add '-28' to each side of the equation. 28 + -28 + -2a = 12 + -28 Combine like terms: 28 + -28 = 0 0 + -2a = 12 + -28 -2a = 12 + -28 Combine like terms: 12 + -28 = -16 -2a = -16 Divide each side by '-2'. a = 8 Simplifying a = 8
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