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Simplifying 12 = 9a + -15 Reorder the terms: 12 = -15 + 9a Solving 12 = -15 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. 12 + -9a = -15 + 9a + -9a Combine like terms: 9a + -9a = 0 12 + -9a = -15 + 0 12 + -9a = -15 Add '-12' to each side of the equation. 12 + -12 + -9a = -15 + -12 Combine like terms: 12 + -12 = 0 0 + -9a = -15 + -12 -9a = -15 + -12 Combine like terms: -15 + -12 = -27 -9a = -27 Divide each side by '-9'. a = 3 Simplifying a = 3
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