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Simplifying 2a + 16 = 21 + -7a Reorder the terms: 16 + 2a = 21 + -7a Solving 16 + 2a = 21 + -7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7a' to each side of the equation. 16 + 2a + 7a = 21 + -7a + 7a Combine like terms: 2a + 7a = 9a 16 + 9a = 21 + -7a + 7a Combine like terms: -7a + 7a = 0 16 + 9a = 21 + 0 16 + 9a = 21 Add '-16' to each side of the equation. 16 + -16 + 9a = 21 + -16 Combine like terms: 16 + -16 = 0 0 + 9a = 21 + -16 9a = 21 + -16 Combine like terms: 21 + -16 = 5 9a = 5 Divide each side by '9'. a = 0.5555555556 Simplifying a = 0.5555555556
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