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Simplifying 19 = a + 21 Reorder the terms: 19 = 21 + a Solving 19 = 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. 19 + -1a = 21 + a + -1a Combine like terms: a + -1a = 0 19 + -1a = 21 + 0 19 + -1a = 21 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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