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Simplifying 12r2 + 12a + 7 = -2 Reorder the terms: 7 + 12a + 12r2 = -2 Solving 7 + 12a + 12r2 = -2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + 12a + -7 + 12r2 = -2 + -7 Reorder the terms: 7 + -7 + 12a + 12r2 = -2 + -7 Combine like terms: 7 + -7 = 0 0 + 12a + 12r2 = -2 + -7 12a + 12r2 = -2 + -7 Combine like terms: -2 + -7 = -9 12a + 12r2 = -9 Add '-12r2' to each side of the equation. 12a + 12r2 + -12r2 = -9 + -12r2 Combine like terms: 12r2 + -12r2 = 0 12a + 0 = -9 + -12r2 12a = -9 + -12r2 Divide each side by '12'. a = -0.75 + -1r2 Simplifying a = -0.75 + -1r2
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