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Simplifying 12 + 9a = 8 + -4a Solving 12 + 9a = 8 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. 12 + 9a + 4a = 8 + -4a + 4a Combine like terms: 9a + 4a = 13a 12 + 13a = 8 + -4a + 4a Combine like terms: -4a + 4a = 0 12 + 13a = 8 + 0 12 + 13a = 8 Add '-12' to each side of the equation. 12 + -12 + 13a = 8 + -12 Combine like terms: 12 + -12 = 0 0 + 13a = 8 + -12 13a = 8 + -12 Combine like terms: 8 + -12 = -4 13a = -4 Divide each side by '13'. a = -0.3076923077 Simplifying a = -0.3076923077
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