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Simplifying 12a + 9 = 7 + -20a Reorder the terms: 9 + 12a = 7 + -20a Solving 9 + 12a = 7 + -20a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '20a' to each side of the equation. 9 + 12a + 20a = 7 + -20a + 20a Combine like terms: 12a + 20a = 32a 9 + 32a = 7 + -20a + 20a Combine like terms: -20a + 20a = 0 9 + 32a = 7 + 0 9 + 32a = 7 Add '-9' to each side of the equation. 9 + -9 + 32a = 7 + -9 Combine like terms: 9 + -9 = 0 0 + 32a = 7 + -9 32a = 7 + -9 Combine like terms: 7 + -9 = -2 32a = -2 Divide each side by '32'. a = -0.0625 Simplifying a = -0.0625
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