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Simplifying 9 = 21 + 3a Solving 9 = 21 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 9 + -3a = 21 + 3a + -3a Combine like terms: 3a + -3a = 0 9 + -3a = 21 + 0 9 + -3a = 21 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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