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Simplifying 9r2 + 12a + 4 = 0 Reorder the terms: 4 + 12a + 9r2 = 0 Solving 4 + 12a + 9r2 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + 12a + -4 + 9r2 = 0 + -4 Reorder the terms: 4 + -4 + 12a + 9r2 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 12a + 9r2 = 0 + -4 12a + 9r2 = 0 + -4 Combine like terms: 0 + -4 = -4 12a + 9r2 = -4 Add '-9r2' to each side of the equation. 12a + 9r2 + -9r2 = -4 + -9r2 Combine like terms: 9r2 + -9r2 = 0 12a + 0 = -4 + -9r2 12a = -4 + -9r2 Divide each side by '12'. a = -0.3333333333 + -0.75r2 Simplifying a = -0.3333333333 + -0.75r2
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