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Simplifying 12a + 4 + -3a + 15 = 7 Reorder the terms: 4 + 15 + 12a + -3a = 7 Combine like terms: 4 + 15 = 19 19 + 12a + -3a = 7 Combine like terms: 12a + -3a = 9a 19 + 9a = 7 Solving 19 + 9a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + 9a = 7 + -19 Combine like terms: 19 + -19 = 0 0 + 9a = 7 + -19 9a = 7 + -19 Combine like terms: 7 + -19 = -12 9a = -12 Divide each side by '9'. a = -1.333333333 Simplifying a = -1.333333333
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