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Simplifying a + 2(a + -2) = 21 + 3 Reorder the terms: a + 2(-2 + a) = 21 + 3 a + (-2 * 2 + a * 2) = 21 + 3 a + (-4 + 2a) = 21 + 3 Reorder the terms: -4 + a + 2a = 21 + 3 Combine like terms: a + 2a = 3a -4 + 3a = 21 + 3 Combine like terms: 21 + 3 = 24 -4 + 3a = 24 Solving -4 + 3a = 24 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 + 4 + 3a = 24 + 4 Combine like terms: -4 + 4 = 0 0 + 3a = 24 + 4 3a = 24 + 4 Combine like terms: 24 + 4 = 28 3a = 28 Divide each side by '3'. a = 9.333333333 Simplifying a = 9.333333333
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