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Simplifying 6 + -3a + -3 = 21 Reorder the terms: 6 + -3 + -3a = 21 Combine like terms: 6 + -3 = 3 3 + -3a = 21 Solving 3 + -3a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -3a = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -3a = 21 + -3 -3a = 21 + -3 Combine like terms: 21 + -3 = 18 -3a = 18 Divide each side by '-3'. a = -6 Simplifying a = -6
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