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Simplifying 5a = 21 + 2a Solving 5a = 21 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 5a + -2a = 21 + 2a + -2a Combine like terms: 5a + -2a = 3a 3a = 21 + 2a + -2a Combine like terms: 2a + -2a = 0 3a = 21 + 0 3a = 21 Divide each side by '3'. a = 7 Simplifying a = 7
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