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Simplifying 21a + -28 = 12a + 3 Reorder the terms: -28 + 21a = 12a + 3 Reorder the terms: -28 + 21a = 3 + 12a Solving -28 + 21a = 3 + 12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12a' to each side of the equation. -28 + 21a + -12a = 3 + 12a + -12a Combine like terms: 21a + -12a = 9a -28 + 9a = 3 + 12a + -12a Combine like terms: 12a + -12a = 0 -28 + 9a = 3 + 0 -28 + 9a = 3 Add '28' to each side of the equation. -28 + 28 + 9a = 3 + 28 Combine like terms: -28 + 28 = 0 0 + 9a = 3 + 28 9a = 3 + 28 Combine like terms: 3 + 28 = 31 9a = 31 Divide each side by '9'. a = 3.444444444 Simplifying a = 3.444444444
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