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Simplifying 6a + -3(a + -3) = 21 Reorder the terms: 6a + -3(-3 + a) = 21 6a + (-3 * -3 + a * -3) = 21 6a + (9 + -3a) = 21 Reorder the terms: 9 + 6a + -3a = 21 Combine like terms: 6a + -3a = 3a 9 + 3a = 21 Solving 9 + 3a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3a = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 3a = 21 + -9 3a = 21 + -9 Combine like terms: 21 + -9 = 12 3a = 12 Divide each side by '3'. a = 4 Simplifying a = 4
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