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Simplifying 21(a + 9) = 0 Reorder the terms: 21(9 + a) = 0 (9 * 21 + a * 21) = 0 (189 + 21a) = 0 Solving 189 + 21a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-189' to each side of the equation. 189 + -189 + 21a = 0 + -189 Combine like terms: 189 + -189 = 0 0 + 21a = 0 + -189 21a = 0 + -189 Combine like terms: 0 + -189 = -189 21a = -189 Divide each side by '21'. a = -9 Simplifying a = -9
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