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Simplifying 21 = a + 20 Reorder the terms: 21 = 20 + a Solving 21 = 20 + 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. 21 + -1a = 20 + a + -1a Combine like terms: a + -1a = 0 21 + -1a = 20 + 0 21 + -1a = 20 Add '-21' to each side of the equation. 21 + -21 + -1a = 20 + -21 Combine like terms: 21 + -21 = 0 0 + -1a = 20 + -21 -1a = 20 + -21 Combine like terms: 20 + -21 = -1 -1a = -1 Divide each side by '-1'. a = 1 Simplifying a = 1
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