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Simplifying a + 3 = 12 + -12a Reorder the terms: 3 + a = 12 + -12a Solving 3 + a = 12 + -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. 3 + a + 12a = 12 + -12a + 12a Combine like terms: a + 12a = 13a 3 + 13a = 12 + -12a + 12a Combine like terms: -12a + 12a = 0 3 + 13a = 12 + 0 3 + 13a = 12 Add '-3' to each side of the equation. 3 + -3 + 13a = 12 + -3 Combine like terms: 3 + -3 = 0 0 + 13a = 12 + -3 13a = 12 + -3 Combine like terms: 12 + -3 = 9 13a = 9 Divide each side by '13'. a = 0.6923076923 Simplifying a = 0.6923076923
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