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Simplifying 7a + -21 = 0 Reorder the terms: -21 + 7a = 0 Solving -21 + 7a = 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 + 7a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 7a = 0 + 21 7a = 0 + 21 Combine like terms: 0 + 21 = 21 7a = 21 Divide each side by '7'. a = 3 Simplifying a = 3
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