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Simplifying 4 + 7a = 28 + 4a + -9a Combine like terms: 4a + -9a = -5a 4 + 7a = 28 + -5a Solving 4 + 7a = 28 + -5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5a' to each side of the equation. 4 + 7a + 5a = 28 + -5a + 5a Combine like terms: 7a + 5a = 12a 4 + 12a = 28 + -5a + 5a Combine like terms: -5a + 5a = 0 4 + 12a = 28 + 0 4 + 12a = 28 Add '-4' to each side of the equation. 4 + -4 + 12a = 28 + -4 Combine like terms: 4 + -4 = 0 0 + 12a = 28 + -4 12a = 28 + -4 Combine like terms: 28 + -4 = 24 12a = 24 Divide each side by '12'. a = 2 Simplifying a = 2
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