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Simplifying 7a + 19 + -6a = 21 Reorder the terms: 19 + 7a + -6a = 21 Combine like terms: 7a + -6a = 1a 19 + 1a = 21 Solving 19 + 1a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + 1a = 21 + -19 Combine like terms: 19 + -19 = 0 0 + 1a = 21 + -19 1a = 21 + -19 Combine like terms: 21 + -19 = 2 1a = 2 Divide each side by '1'. a = 2 Simplifying a = 2
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