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Simplifying 9a + 12 = 15 + 16a Reorder the terms: 12 + 9a = 15 + 16a Solving 12 + 9a = 15 + 16a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-16a' to each side of the equation. 12 + 9a + -16a = 15 + 16a + -16a Combine like terms: 9a + -16a = -7a 12 + -7a = 15 + 16a + -16a Combine like terms: 16a + -16a = 0 12 + -7a = 15 + 0 12 + -7a = 15 Add '-12' to each side of the equation. 12 + -12 + -7a = 15 + -12 Combine like terms: 12 + -12 = 0 0 + -7a = 15 + -12 -7a = 15 + -12 Combine like terms: 15 + -12 = 3 -7a = 3 Divide each side by '-7'. a = -0.4285714286 Simplifying a = -0.4285714286
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