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Simplifying 12a + -7 + -5a = -20 Reorder the terms: -7 + 12a + -5a = -20 Combine like terms: 12a + -5a = 7a -7 + 7a = -20 Solving -7 + 7a = -20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 7a = -20 + 7 Combine like terms: -7 + 7 = 0 0 + 7a = -20 + 7 7a = -20 + 7 Combine like terms: -20 + 7 = -13 7a = -13 Divide each side by '7'. a = -1.857142857 Simplifying a = -1.857142857
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