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Simplifying 21a + 6(a + -2) = 12 Reorder the terms: 21a + 6(-2 + a) = 12 21a + (-2 * 6 + a * 6) = 12 21a + (-12 + 6a) = 12 Reorder the terms: -12 + 21a + 6a = 12 Combine like terms: 21a + 6a = 27a -12 + 27a = 12 Solving -12 + 27a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 27a = 12 + 12 Combine like terms: -12 + 12 = 0 0 + 27a = 12 + 12 27a = 12 + 12 Combine like terms: 12 + 12 = 24 27a = 24 Divide each side by '27'. a = 0.8888888889 Simplifying a = 0.8888888889
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