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Simplifying 4a = 21 + a Solving 4a = 21 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 4a + -1a = 21 + a + -1a Combine like terms: 4a + -1a = 3a 3a = 21 + a + -1a Combine like terms: a + -1a = 0 3a = 21 + 0 3a = 21 Divide each side by '3'. a = 7 Simplifying a = 7
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