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Simplifying 12a + -1 = 4a + 39 Reorder the terms: -1 + 12a = 4a + 39 Reorder the terms: -1 + 12a = 39 + 4a Solving -1 + 12a = 39 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. -1 + 12a + -4a = 39 + 4a + -4a Combine like terms: 12a + -4a = 8a -1 + 8a = 39 + 4a + -4a Combine like terms: 4a + -4a = 0 -1 + 8a = 39 + 0 -1 + 8a = 39 Add '1' to each side of the equation. -1 + 1 + 8a = 39 + 1 Combine like terms: -1 + 1 = 0 0 + 8a = 39 + 1 8a = 39 + 1 Combine like terms: 39 + 1 = 40 8a = 40 Divide each side by '8'. a = 5 Simplifying a = 5
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