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Simplifying 3a + -21 = 0 Reorder the terms: -21 + 3a = 0 Solving -21 + 3a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3a = 0 + 21 3a = 0 + 21 Combine like terms: 0 + 21 = 21 3a = 21 Divide each side by '3'. a = 7 Simplifying a = 7
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